My wife is a Canadian citizen (she was born and raised in Canada, we married in Ireland in 2008 and came to Canada in 2010 when we started our Visa application process). I'm an Irish national and have sole custody of my four children from a previous relationship (three of them are currently in Canada with me and my wife - we are on temporary visitor permits). We have put in our application for family class sponsorship. My wife was approved as a sponsor (in April) and our application was sent to London (we applied outbound). London recently contacted us looking for the biological mother of my children to sign a letter in the presence of a magistrate/commissioner of oaths/justice of the peace stating she gives permission for the kids to apply for permanent residency in Canada. A year ago she signed/dated a letter (but it was not witnessed by any of the above) and we included that in our application (as was advised by our attorney). Things aren't good between me and my ex and now she's refusing all contact. She said she wasn't going to sign anything else. I have numerous e-mails where she says she sent the last letter, that she knows the kids are here, that she's happy they are here because she knows there is nothing for them in Ireland at the moment, etc. My question is... what do I do now?? She already gave permission (and e-mailed to let me know she'd signed and sent the letter, so she wasn't under any duress at the time of signing)... how can she now change her mind when our application is nearly processed? Is there anything I/we can do? We've been given 60 days to respond and if my ex doesn't sign this letter, our application is going to be denied. Please, help!