Well, you could always go and rent a flute and join the fray. Family jam sessions are always a lot of fun. But, seriously, if your (dd?)s are as natural as your 5-year old is, the musical training will not only fulfill the yearnings of their soul but could be a meaningful future career although most musicians are not rock stars or soloists at Carnegie Hall. But, hey, there are a lot worse things that kids could be doing. It seems like you have a pretty amazing bunch. Enjoy that while you can.
Thanks for the updates.