Storge is the word for family love, such as the love of a parent toward a child. In social psychology, it is form of loving evolved from friendship.
Storgic lovers are friends first. Storgic love develops gradually out of friendship, and the friendship can endure beyond the breakup of the relationship. Storgic lovers choose their mates based on homogamy, and sometimes cannot pinpoint the moment that friendship turned to love. Storgic lovers want their significant others to also be their best friends.