Nobody forces anybody to start a family, though. The author talks about it as if it was mandatory, and then puts it as some chore.
[0]: http://www.nmhc.org/Content.aspx?id=4708, see the table "State Distribution of Apartment Residents, 2015", which shows that most US residents live in non-apartment homes.
"But when we marry and start a family, we are pushed, by custom, policy, and expectation, to move into our own houses. And when we have kids, we find ourselves tied to those houses."