The straight answer according to Sharia is Husband, she need to follow him wherever he goes.
thats all very well, but should her husband be putting her in that dilemma in the first place?? he is aware that she is an only child, regardless is she ends up going cause "its the right thing to do" she will end up resenting this decision and more likely resent her husband for the move.
funny how he's ok to go for their future and the future of their kids, and he's ok NOT to go if HIS parents dont get their visa!!! what about her parents?????
what is she supposed to do? go play happy familys in Canada whilst knowing her parents are all alone??
Just because a girl has got married, that doesnt automatically programme her to forget or feel nothing towards her own family. how selfish of him. her husband has also a responsibility towards them, they gave him their only child in marraige, he should be the son they never had.
sorry to sound so harsh, but you only get 1 set of parents where as you can always get another husband