My kids would definitely play outside all day instead of being cooped up with adults. Yes, even in the cold. So I like the stomp rocket idea, or a fun playground ball provides a lot of entertainment.

Great suggestions!

I would add Sequence (junior version without words) and that Taco Cat card game. Also Gnomes at Night if an adult can help the 4yo a bit.

I think this depends a lot of the 11 year old. Not every kid is willing to play down to a 4 year olds level and be nice about it (my oldest would, but I don’t think all her friends would/could). I think it would be safe to assume a grown up will need to help. Please make sure someone also gives the 11 year old some age appropriate attention and/or space to do their own thing.

Did anyone say Guess who? My kids loved that at 4. Also Connect 4.

Mancala, Uno

But the adults need to engage the four year old unless the 11 year old is explicitly babysitting.

Also get big white paper and markers/crayons/etc.

Loose glitter is the devil but glitter in paint or glue is always a hit.