Have you ever played this game? Musical potties? I didn't know it existed until now! :)
This is how you play: train two-year-old on how to go pee-pee and poop on the potty. She masters it, yet occasionally pees the bed. Some weeks are better than others and some days are rather not perfect.
Have a lower potty seat in the girls' bathroom along with the normal porcelain god. And it's even better if you have a two-bathroom place.
You go from potty-to-potty and allow your child to pee in different potties. FUN! Especially when she insists on closing the door and then continues to put toilet paper in the potty. Or when the younger one fights for the lower potty to go "PEE PEE IN THA POTTY MOMMMMMMMMMMMMIIIEEEEEEE!"