It makes more sense for Batman to have a huge pseudo-family than Superman, ironically. I remember an old study, possibly bull, I read once about how the more mature and adjusted you are, the fewer friends you have, and the less those friends act as a surrogate family. Supes is more "family values," but on the other hand, also more adjusted. Bruce, well . . .
Aaron "The Mad Whitaker" Bourque; and he tends to attract those who need a surrogate family, too, who bring their own surrogate family into an ever widening circle.