Hi yet again, all...
Firstly, I would like to profusely thank all of you who have read and/or responded to any of my myriad questions before--I'm starting to feel like I'm annoying people with so many posts
I try to pay it forward and answer some myself, when I'm pretty sure I have correct info (though I have been corrected a couple of times). Anyway, every time I feel like we have everything sorted, there is just "one last" loose end that presents itself. I am hoping this is the very last "one last" loose end.
The short version of the question is: If my husband's former daughter (who has been adopted by her maternal grandparents, who he cannot get to respond to contact) is listed on Form IMM5406E Additional Family Members (which requires him to list her under Section B Children), how can we prove that she is no longer his child, and is therefore not a non-accompanying dependent child? (Background below)
Alrighty--here goes... My husband is American and we are doing inland. My husband had a daughter in 2002. He went to court, the mother was deemed unfit, and he ended up getting full custody. He and his daughter lived in New Orleans and my husband's mother helped him out (his father was already deceased). Then hurricane Katrina happened in 2005. Everything in New Orleans was trashed and there was no work, so my husband left his 3-year-old daughter with her mother's parents (who were the only ones capable of caring for her at the time), and went to Las Vegas where he could get work (he is a Stagehand).
New Orleans was pretty screwed up for a long time, and despite wanting to return to his daughter, my husband could not find work there. In 2007, my husband's mother passed away, leaving him with absolutely no support system. By this point, his daughter had been living with her maternal grandparents for 2 years. They suggested they would adopt her, if my husband voluntarily relinquished his parental rights. My husband's daughter was in a stable home environment, and was used to it. He felt he could not support his daughter financially, and no longer had help with other aspects of support from his mother. Given all of this, he decided to voluntarily relinquish his parental rights and his daughter's maternal grandparents adopted her. It was a difficult thing to do, but he felt it was the best thing for his daughter.
Now... He legally has no child anymore, and the IRPA definition clearly states a dependent child "is the biological child of the parent, if the child has not been adopted by a person other than the spouse or common-law partner of the parent." Since his daughter has been adopted by someone other than his spouse (me), we know she is not a dependent child and does not need to be included on this application in that sense. And in this case we wouldn't even have to mention her.......
BUT...
Form IMM5406E Additional Family Members requires him to list her under Section B Children. The guide specifically states that you must list "any of your children who have been adopted by others."
I think it's pretty crazy he has to list someone who is not related to him in any way (legally this is how it is now--that's the way adoption works--it's made so it's like he never even existed as her father). But regardless, we of course do not want any misrepresentation to happen, so from the way I have read this, I'm pretty sure she has to be listed on this form.
So, the question is... If she is on this form, they know she exists--how the hell do we prove she is no longer his daughter, and therefore not a non-accompanying dependent child that must be included in the application? He has no paperwork regarding the adoption. He can't get anything regarding it, either--once an adoption is finalized in Louisiana everything to do with it is sealed up in the records forever--like it never even happened. No one can access it. Ever.
We know she is not his dependent child. But once we mention her (which according to my interpretation of what the guide states, we must on this form)... yes, we can write an explanation. But I feel like they will want some kind of proof that he relinquished his parental rights and this adoption took place. They surely aren't just going to take his word for it.
I have considered that they might accept something from his daughter's maternal grandparents (an affidavit or something attesting to the fact that this all happened). BUT, my husband does not have any contact with them anymore (he sends birthday and holiday wishes to his daughter, but never gets a response, and has even tried emailing the grandmother about speaking on the phone with his daughter, but never gets a response), so I highly doubt they would even respond at all to such a request, even to say no they won't do it. That child is legally their child, not his in any way, and they have every right to simply ignore my husband (sadly). The grandparents might still have some adoption paperwork hanging around their house but... they won't respond to him at all, let alone do him any favours.
Given the above, I have considered that he could do a Statutory Declaration attesting to the fact that all this happened. This can be done for the severance of former common-law relationships without the involvement of the other party at all--and I'm pretty sure that is because there is no documentation of such a relationship ending, and it could be impossible for one to have them involved (you can't find your former common-law partner years later, or they refuse to help you out with this, or flat out ignore you). This case is also the legal severance of a relationship with the absence of any documentation, where it is impossible to have the other parties involved in a declaration.
If a notarized Statutory Declaration won't do... what the heck else would? I am thinking to just do this, and if it's not enough for them, they will ask specifically for something else (although I really can't think of a single other thing they could request that is possible to attain).
I haven't seen any other posts on here with a similar situation... and I think this is likely a pretty rare circumstance... But if anyone out there has any ideas about this, I would be eternally grateful for your insight.
Thank you all for reading <3
Firstly, I would like to profusely thank all of you who have read and/or responded to any of my myriad questions before--I'm starting to feel like I'm annoying people with so many posts

The short version of the question is: If my husband's former daughter (who has been adopted by her maternal grandparents, who he cannot get to respond to contact) is listed on Form IMM5406E Additional Family Members (which requires him to list her under Section B Children), how can we prove that she is no longer his child, and is therefore not a non-accompanying dependent child? (Background below)
Alrighty--here goes... My husband is American and we are doing inland. My husband had a daughter in 2002. He went to court, the mother was deemed unfit, and he ended up getting full custody. He and his daughter lived in New Orleans and my husband's mother helped him out (his father was already deceased). Then hurricane Katrina happened in 2005. Everything in New Orleans was trashed and there was no work, so my husband left his 3-year-old daughter with her mother's parents (who were the only ones capable of caring for her at the time), and went to Las Vegas where he could get work (he is a Stagehand).
New Orleans was pretty screwed up for a long time, and despite wanting to return to his daughter, my husband could not find work there. In 2007, my husband's mother passed away, leaving him with absolutely no support system. By this point, his daughter had been living with her maternal grandparents for 2 years. They suggested they would adopt her, if my husband voluntarily relinquished his parental rights. My husband's daughter was in a stable home environment, and was used to it. He felt he could not support his daughter financially, and no longer had help with other aspects of support from his mother. Given all of this, he decided to voluntarily relinquish his parental rights and his daughter's maternal grandparents adopted her. It was a difficult thing to do, but he felt it was the best thing for his daughter.
Now... He legally has no child anymore, and the IRPA definition clearly states a dependent child "is the biological child of the parent, if the child has not been adopted by a person other than the spouse or common-law partner of the parent." Since his daughter has been adopted by someone other than his spouse (me), we know she is not a dependent child and does not need to be included on this application in that sense. And in this case we wouldn't even have to mention her.......
BUT...
Form IMM5406E Additional Family Members requires him to list her under Section B Children. The guide specifically states that you must list "any of your children who have been adopted by others."
I think it's pretty crazy he has to list someone who is not related to him in any way (legally this is how it is now--that's the way adoption works--it's made so it's like he never even existed as her father). But regardless, we of course do not want any misrepresentation to happen, so from the way I have read this, I'm pretty sure she has to be listed on this form.
So, the question is... If she is on this form, they know she exists--how the hell do we prove she is no longer his daughter, and therefore not a non-accompanying dependent child that must be included in the application? He has no paperwork regarding the adoption. He can't get anything regarding it, either--once an adoption is finalized in Louisiana everything to do with it is sealed up in the records forever--like it never even happened. No one can access it. Ever.
We know she is not his dependent child. But once we mention her (which according to my interpretation of what the guide states, we must on this form)... yes, we can write an explanation. But I feel like they will want some kind of proof that he relinquished his parental rights and this adoption took place. They surely aren't just going to take his word for it.
I have considered that they might accept something from his daughter's maternal grandparents (an affidavit or something attesting to the fact that this all happened). BUT, my husband does not have any contact with them anymore (he sends birthday and holiday wishes to his daughter, but never gets a response, and has even tried emailing the grandmother about speaking on the phone with his daughter, but never gets a response), so I highly doubt they would even respond at all to such a request, even to say no they won't do it. That child is legally their child, not his in any way, and they have every right to simply ignore my husband (sadly). The grandparents might still have some adoption paperwork hanging around their house but... they won't respond to him at all, let alone do him any favours.
Given the above, I have considered that he could do a Statutory Declaration attesting to the fact that all this happened. This can be done for the severance of former common-law relationships without the involvement of the other party at all--and I'm pretty sure that is because there is no documentation of such a relationship ending, and it could be impossible for one to have them involved (you can't find your former common-law partner years later, or they refuse to help you out with this, or flat out ignore you). This case is also the legal severance of a relationship with the absence of any documentation, where it is impossible to have the other parties involved in a declaration.
If a notarized Statutory Declaration won't do... what the heck else would? I am thinking to just do this, and if it's not enough for them, they will ask specifically for something else (although I really can't think of a single other thing they could request that is possible to attain).
I haven't seen any other posts on here with a similar situation... and I think this is likely a pretty rare circumstance... But if anyone out there has any ideas about this, I would be eternally grateful for your insight.
Thank you all for reading <3