Single player games fun to play around tv / switch controls :
Firewatch - about 6 to 10 hours narrative walking exploring adventure with beautiful scenery. Teens and up probably.
Outer wilds : astonishing space exploration game. So many mysteries and puzzles and wonders and connections to be made. Cannot recommend highly enough.
Tale of two brothers. There's sadness in this game but handled very well. If you're ready to discuss life and death with your kids. Beautiful graphics and fun puzzles.
Machinerium / Botanicula / Samorost, of course. Beautiful and lovely and happiness inducing.
Tons of point and click adventures.
Coop
It takes two - might be super fun for your kids to play as parents! Beautiful graphics and fun gameplay.
Lovers in dangerous space time - technically there's guns but nothing with people or anything recognizable.
Overcooked - if no guns is really a strict mandate :)