In order to properly dominate the bed, send mum away for a night. Then sleep in the middle. Dad will not take over the rest of the bed because he doesn't want to squash you. Bed domination achieved!
It works really well when you spread out in the middle of the bed and sleep the "wrong" way around. Then you can really take over.
Mum has been away for two days with work. Did she bring me any new mouses from this "work"? No! Honestly, I don't know where I'm going wrong with her. And this morning she picked up all the mouses I have strategically placed around the house and put them away. Don't worry, by the time she gets home later today they will be back where they belong... spread around the house where everyone can admire them (except Salvador, he is not allowed to play with my mouses).