Stardew Valley is a farming simulation role-playing video game originally released in 2016, in which the player's character takes over their grandfather's farm in a place called Stardew Valley. The gameplay is colorful and generally peaceful, although the player can battle some monsters, like slimes, in the mines. It is currently rated Everyone 10+
Until this year, players could only play by themselves, which meant that it was a fairly safe game for children to play. But in 2018, a four-player cooperative option was added to the Windows version, with plans for adding a cooperative version to the other platforms soon.
Stardew Valley is available on several platforms: computers or laptops running Microsoft Windows, OS X, or Linux, PlayStation 4, PlayStation Vita, Xbox One, and Nintendo Switch.
Stardew Valley doesn't currently feature anything that resembles parental controls, but you can use the parental controls on the various platforms it operates on to monitor your child's gameplay.
In order to engage in the cooperative multiplayer, each player must purchase their own copy of Stardew Valley and already have it downloaded on their computer. One player sets up as a host and the other three join in. They work on one farm together and can chat in-game. In multiplayer mode, there is a chance that your child could communicate with adults. The chat cannot be disabled, unfortunately.