I've already got a tandem for me to captain. I can put a kid or my fiance on the stoker seat.
She's looking to get a tandem that'll fit her so she can captain and throw her kid on the back. She's 5'3" so most of the small frames out there are even too big. We're not looking to do any racing or any super-long-distance touring. Mostly, it'll just be for a 30-50 mile day with lots of stops during the ride for sight-seeing, letting the kids play, etc.
What do you guys recommend? We're on a budget so we're NOT considering a custom build.