Edit: Since HN contrarians who'd never want their children living in some particular conditions find it so confusing how others might not too:
https://www.sciencedirect.com/science/article/abs/pii/S01452...
https://pmc.ncbi.nlm.nih.gov/articles/PMC3805127/
Overcrowded living quarters is a well known vector for a huge array of problems. Academic underachievement, sexual abuse, substance abuse, mood disorders, abusive relationships, the list goes on. Even after controlling for socioeconomic status!