The emergence of the IT industry made job availability in foreign countries to Indians increased. So we see many people settling there. Once they settle there the children born there will become the citizens of that country. So the parents may not be able to come back leaving children there.
Another thing is that houses are not very costly in those countries. In fact about 8-10 years back there was a recessionary trend going in some of the western countries and then the house prices even decreased substantially and at that time many Indian people easily bought the house there.
Some of the countries like Canada welcome people from outside because their population is less and they want workforce to work in their country so that they progress more and more.
Knowledge is power.
Similarly such persons totally ignore their own house in the mother country either by selling or demolishing in the view that they are not totally coming back to the motherland. They should realize with what love and effort their parents constructing the house and for whom they built the house. If it is so, they need not tell their motherland as motherland.
Many houses found in destitute level as their children are in foreign countries.