Diana,
The
Hat Lady at the
Rose & Crown used to be at the popular Adventurer's Club at Pleasure Island that was shuttered many years ago. She now performs regularly at this Epcot World Showcase restaurant, entertaining and lifting the spirits of the guests.
As I understand it, Pam Brody is now retired as the piano-playing entertainment, but I am not 100% sure if that is accurate.
You can find the Hat Lady's daily performance times on the Walt Disney World website. Her performances are lively, and certainly not too randy. She is particularly known for leading sing-a-longs to tunes that your kids would probably not know. But it is a bar in that area, so you will have to judge for yourself if the atmosphere is friendly enough for them when you get there. A lot can depend on what other patrons are in the space at the time.
BOTTOM LINE: I certainly would try it. It is a great meal venue, but if you can get a table out on the porch area I would take it, swapping the performance value for the incredible views of the lagoon and possibly the fireworks show!
Have a magical vacation!