[mneil]

Super Mario Wonder has excellent multiplayer mechanics including characters that don't take damage and respawn as long as one character survived. Game might be tough still at 5.

Kirby and the forgotten land has a second player that takes damage but respawns is they die. Items like food can be shared which makes for a really mechanic where the two of you can celebrate a health share when eating.

No reload heroes allowed players to save each other when they "die". It's a generator dungeon crawler with lots of replay time for fairly cheap.

Unraveled two literally allows you to carry the other person. Admittedly some parts require two players and may be frustrating at 5.

Mario kart 8 is amazing for young kids. Options exist to self propel and keep your kart on the track. You can set you controller down and still finish a race. The colors, music, and powerups are all appealing.

Minecraft. Both my kids started around 5. Peaceful mode, help them learn to build. By age 7 they will be teaching you how to play. This game goes deep but starts shallow. There's a reason it's so popular with kids. I love it as well.