I don't have it front of me, but I believe I read a submission by UNICEF whereby they outlined some very interesting suggestions on providing avenues for the children of individuals in polygamous relationships to be able to access their rights. If they are international and one of their parents is residing in Canada and deemed inadmissible in this case, they could perhaps seek refuge in Canada. As well, if those children are currently residing...to remain with their parent who is also part of the polygamous relationship.
I encourage you to review those submissions from UNICEF.