YES, Lucy knows how to play the pipe organ that was in their childhood dilapidated clocktower, lmfao. Her mom used to do that a LOT, as a stereotypical villain vampire, and Lucy was essentially her heir, as the oldest child... SO YEAH!
Claire knows how to play the piano, I think... tons of time at home with the wifey to learn new things<3 And I think it'd be cute if Letty knew how to play guitar or ukulele !!!