Executive summary (added September 10, 2018): The family is a mixed community, consisting of a society and a non-social community. Usually the society is a married couple; if they have children, these constitute the nursery, which is the non-social part of the family. The children need an ordered, regular life. They grow up and leave the nursery; the parents may replenish it.
This chapter and the next concern the family, which like most communities is a mixed community (22. 11): part of it is a non-social community, but some part of it is a society proper (22. 1), this being, again, as in Chapter XX especially, a community constituted as an act of will on the part of its members.
Polytropy 