Configuration
a) spacing & gender of siblings
b) adult children moving back home
c) grandparents or other relatives moving in w/ nuclear family (multigenerational family household)
d) 1st born/last born: 1st - get more attention, affection, & verbal stimulations but more maturity is expected, often get more help solving problems from mother, higher expectations for achievement
e) siblings provide cooperation, competition, empathy, aggression, leading, following, etc.
f) only children - more positive & affectionate with parents, more advanced socially, perform better academically, have more pressure from parents to succeed, loneliness, and no help caring for aging parents