The Proclamation on the Family called on governments and decision-makers (which in a democracy includes us) to “promote those measures designed to maintain and strengthen the family as the fundamental unit of society.” What those measures are has prompted some debate.
Nick Gilbert suggests (with graphs!) that “family-friendly” policies like extended Family medical leave, subsidized day care, and so forth, are really “market friendly” policies. That is, they subsidize the transition of women to the workforce at the expense single income families. Read the whole thing.