Games for kids??

I'm aware it's off topic.

Ive got a neice and nephew ages 2 and 4. Being a 16yr old aunt kinda means I'm the one who has to entertain them when they stay over, which I don't mind, but I'm running out of things to do with them at home. Have any of you got some games and ideas So i can entertain them?

P.s- It sounds as thought my mum leaves me on my own to deal with them but she doesn't it's just for when she's doing dinner or something that they need to have something to do ahahaha