The so called historical nuclear family is a myth. Just in my family alone during the depression, three out of the four families my parents and inlaws grew up in, farmed their children out to relatives, older siblings or in one case the neighbors. Two dads were often absent because they were traveling trying to find work, with 2 stay at home moms and 2 part time working moms (school teacher and family hardware business). One set of parents divorced. One mother was committed to a mental hospital. Oh, one dad was found to actually have two families.
I can cite lots of similar cases.