One of my step sons is peeing on the bathroom floor purposely. They've both never been the best aim and have always got a little on the seat (been trying to get them to put it up when they wee but they are very difficult to teach and literally take nothing that I say on board). But recently someone has been weeing on the floor. Not a full wee, but not a little bit, and I'm not sure if it's attention seeking behaviour.
How can I find out who's been doing it and put a stop to it? It's driving me crazy.