My wife and I are expecting our first child next month. We’ve been married for 7.5 years at this point, and so far as we’re concerned, we’ve been “a family” since then. Hell, we’ve probably been a family since we started living together, but the marriage removed any linguistical wiggle room. When the baby comes, we’ll be adding to the family, not creating one, and I get mildly annoyed when people imply that we weren’t a family already. (Not enough to complain, but it raises metaphorical hackles.)
I’ve noticed, however, that it’s common for couples expecting their first baby to say things like “we’re looking forward to becoming a family.” Come to think of it, having a kid is often called “starting a family.” I noticed this before we were expecting, but I hear it a lot more often now that I talk to a lot more pregnant people.
I’m sure some people who talk about their new family are being figurative, and would have considered themselves a family before. But some are serious about not having been a “real family” before children came along.
I’m not sure which viewpoint is more prevalent, so I ask you: what turns a couple into a family? Marriage (or a similar commitment), or kids?