playing live games with different xbox consoles

it's not possible cross-play between one and 360, sorry

I'm an xbox administrator and you are unable to connect both to each other. You are going to have to get your son a xbox 360 in order to play with his friend.

true they are not compatible

Hi, I have read through your post and fully understand your situation and the Xbox Ambassadors are here to help.

The Xbox One and Xbox 360 games are not cross-play compatible and playable together, both would have to be playing Xbox 360 games that can be emulated on the Xbox one to be able to play together

here's the link of Xbox 360 playable on Xbox One

https://www.xbox.com/en-US/xbox-one/backward-compatibility

If you are referring to Games for windows live games no you cannot play pc titles on the xbox console. Pc games play on pc, Xbox 360 games play on xbox 360 the two are completely different platforms.