Already regretting this

The small one wanted Roblox, his current favourite YouTuber has been playing it on their iPad. 

We have told him it's not available on UK iPad but we could download it on the Xbox we thought this was the best option so he can only play it with supervision. 

We have turned off all chat etc but still feeling a bit uneasy about the suitability. 

Feeling old and out of our depth with all this stuff. 

Gaming was so much easier when we were little, I remember the zx Sinclair and space Invaders. Loved space invaders.