My wife and I used to both commute by bike, and now that our child is old enough to go on a bike, we'd like to do so again. She has already installed a front-mounted baby seat on her dutch-style bike, the kid loves to ride in it!
However, it seems silly to adapt my road bike for a child seat when we already have a tandem bike made for two adults that would offer a much smoother ride for the child in the stoker's position. Is there such a thing as a seat-post adapter to carry a child seat instead of a saddle, or a baby seat that could replace the saddle?