Little boy getting soaked playing an outdoor water game.
A girl is playing the piano in her living room.
First a boy is referred to, then a girl. You do not get soaked while playing piano, and a piano is played indoors in a living room, not outdoors.
The subject can't be both a girl and a boy.
A child can be a boy or a girl while playing the piano in the living room can not occur while getting soaked playing an outdoor water game.