At long last, B has a bicycle that fits him! I think it is possibly only one size smaller than my bicycle (aka Grandma's, which she is loaning me). It has gears and everything. I'm told almost all the bike's this size were green, so green it is! The hills at the end of the street are still a challenge for, well, all of us, but he has freedom to ride the neighborhood again. He has been low key about it, but I think is pretty happy to have his own bike again.
This does mean all five of us finally have bikes that are our size. We also seem to have five extra bikes in random sizes, some of which we keep for nephews that might stop by. We also have a tiny bike for a niece that may someday want it. I digress. The good news is B has his bike and we're all off to enjoy the beauties of spring.