My 6yo ds is about to start school holidays and I want him to be able to do his Lego, Electronics kit, play his keyboard, etc without my almost 2yo getting in the middle of it. But, my dd adores her big brother and whatever he is doing is what she wants to do. She can open doors, so him going into his room & shutting the door won't work and it's not much fun for him anyway as he likes being near me. She constantly steals his mouse mat of his computer and gets in trouble, but she does it over & over again. So, telling her not to touch his Lego/etc is not going to work.
Do other families manage this? She has plenty of her own toys, but her big brother & his toys always seem more interesting. Basically he's just not got his Lego out for ages and the 2 kids play together, but I know my ds wants to do stuff that's more age appropriate for him, at least some of the time.