Visitor from Mexico - Dual citizenship

[backtoCAN]

Hi everyone,
I need some help determining visa requirements for a visitor to Canada with dual citizenship.  I have family members coming to visit from Mexico for a couple of weeks who have dual Mexican/Dutch citizenship (with both passports).  I know that Dutch citizens do not need a visitor's visa, but Mexican citizens do...   The issue is that Mexican law dictates that you must leave Mexico using your Mexican passport if you have one.  So what would this mean for entering Canada?  And would the officials in Mexico deny boarding the plane to Canada if they didn't have a Visa, even though they also have a Dutch Passport?  Would it be possible to show both passports somehow during travel?   Two of the travellers are young children (does this make a difference?)  The cost for 3 visas is a lot, especially if they might not be needed... Any advice or tips would be appreciated! 
THANKS!!!

[steaky]

It shouldn't be a issue.

It would be an issue if you just got one-way ticket.

[Leon]

They should travel with both passports.  They are legally allowed to hold both passports so it is not a problem.  When leaving Mexico, they show the Mexican passports and keep the Dutch passports tucked away.  On the plane, they tuck the Mexican passports away and when they arrive in Canada, they show the Dutch passports.  I am also a dual citizen and I have done this myself without a problem.  If anybody searches them or asks them and finds both passports, they are still fine because they are perfectly in their right to have both.

[backtoCAN]

Thanks for the suggestions so far... my worry is how the immigration officials in Mexico will react. The fear is that by only presenting a Mexican passport when leaving Mexico that they will not allow boarding because there is no valid visa in there for Canada.  Can you really show 2 passports when leaving Mexico???   To complicate matters further it looks like they have to connect in the US too... which would mean another Visa.   Looking for clear guidance that they will be able to fly from Mex via the US to Canada without any visas, while in possession of a Dutch and Mexican passport.
Thanks again!

[Leon]

In that case, they will have to show both passports when they leave and explain that they are fulfilling their duty of travelling on a Mexican passport but showing that they can get into Canada with the Dutch.  I believe the Dutch are also visa exempt to the US so that shouldn't be a problem.

Since this is a problem that will happen in the Mexican airport upon leaving, they should phone the airline as well as the airport security to ask if there is a problem leaving with 2 passports.  As long as they arrive in Canada with the Dutch passports, they will not have a problem.