Mysterium: our current favourite board game. I bought on recommendation of some random online source (like maybe Reddit) as it was supposed to be a good family game, and it was a bulls-eye hit. We all love it.
The rules seemed complicated when we first read through them, but turned out to be quite intuitive and simple once we got going. (That is my one quibble with this game: they really need to rewrite the rulebook and explain the rules more simply and clearly.) It requires no reading or counting or memorizing or strategizing, and there is very little time pressure, so Adrian can join in without any handicapping or special rules. It’s social and non-competitive and relaxed and fun. It’s akin to Dixit but even better. Plus it’s beautiful!