@idumb: I am not stating a general trend here. It's more from my personal experience. I know of a few families who are family friends that moved just like the way i described and I wondered how they managed to move their finances. One of the uncle and aunt that i know of moved to Canada did so after their youngest son died suddenly in Dhaka and they wanted to live close to their daughter.
I am sorry that it doesn't make sense to you... perhaps you can just ignore my post altogether.