Ah...for a family of 3, we have 13 bikes. Is that excessive?
The Douze cargo bike is the daily driver for the parent who's taking the kid to/from daycare; the other parent rides a Priority Continuum, which has a medium-sized frame and easily-adjustable seatpost, in case we need to switch bikes mid-day (I'm tall-ish, she's short-ish). The kid has her own Woom 1 balance bike, though she'd rather ride in the cargo bike. Then my wife and I each have our own city bike (vintage frame built up w/ modern components), our own touring bike (ditto), and our own vintage Raleigh 3-speed. There's a Dahon Piccolo folding bike (occasionally useful) and an old Columbia tandem (only used when my 12-year-old niece comes over). A 1951 Raleigh Clubman that doesn't get ridden much since the kid came along (more's the pity). And a 2007 Raleigh road bike that I don't ride much either (meh).