Hi
I have two kittens and one old man and one of the kittens keeps weeing on my bed! 
They do use the litter tray and while I can shut them out of my bedroom fairly easily I feel a bit guilty. I live in a three bedroomed terraced property and my room is the only one facing the sun and the old cat likes to lie in there (away from the kittens!) and snooze in the sun.
Is there any way I can encourage the kittens to not do this?
Weirdly, in the other two rooms there are beds but the kittens do not wee on them. 
Thanks!