My parents moved to Karachi too after the partition, and then to UK. What made you move from USA to Canada?
My dad's family initially moved to what's now Bangladesh (East Pakistan back then). After the Pakistani massacre of 1971 there, they managed to leave and moved to Pakistan (ironic, isn't it?) I guess they couldn't go back to India like the 10 million refugees who did that during that war.
As for moving from USA to Canada, it's a long story, but basically it was because the US has really homophobic laws and back in 2004 when we left, it was a real nasty place to live. It's socio-political landscape may be changing but the basic arrogance and homophobia makes it impossible for a US citizen to sponsor his or her same-sex partner. So we came here instead. Toronto at least, is a fantastic city in terms of socio-politics and culture. If it wasn't enclosed in ice and antarctic winds 8 months of the year, it'd be perfect.