No one is breaking up a family. Real families stick together and all move to their legal home - see how that works?
Families live in foreign countries and then move back home all the time.
That's not exactly the truth....90% of the Chinese students who were issued student visas's to the US in the 1990's never returned home....even though it was determined this was the condition of them being issued the visa's in the first place.
Many foreigners who come here to the US never return home....in fact they try to get their families to move here with them by any means available.
So yes, if we begin to deport family members it will break up their families....it doesn't work as much as some might want to imagine it would.