Wife uses a Macbook Air and Ipad for everything.
9yo is getting into pc gaming and has his own desktop.
7yo has a pc but isn't into gaming on it. Uses it for typing/learning mostly. He's an iPad kid and prefers to do anything on that.
3yo is learning to type and uses our 7 yo's pc most of the time. Has an iPad.
Everything is in my office and supervised physically and with web and activity logs.