I had to read these comments twice, because I had assumed the "families" were the immigrants and the "four working adults" were yuppies, both in line with my own experience. It's not immigration that has screwed over family formation - it's the housing racket itself, backed up by oppressive monetary policy that sucks real wealth into the financial industry. Making home ownership into a (guaranteed) investment combined with the individualist ideal of everyone needing their own house has done the equivalent of making everyone start off life with significant debt, and the time to pay it off becomes ever longer.