Not sure the age of the kid, but baldurs gate 3 or divinity original sin 2 is good.

Chaos bane is similar to diablo but didn't click for me. 

I don't know of any mmos that you can split screen

3 people household w/one xbox s and one pc. Which mmorpg can we play with only two devices together?

Dad, wife, kid want to play at the same time a game where we can fight other real people and do quest/campaigns. We currently play Diablo 4 but want to branch out.
Long time ago I used to play warhammer age of reckoning and I enjoyed that style of play. 

We only have xbox s and a PC for the 3 of us to use. 
Any suggestions would be appreciated. Thanks.

3 people household w one xbox and one pc. Which mmorpg can we play at the same time?