Hello
I'm a mother as well...and I wouldn't recommend this game for teenage kids. Xsyon has open-PvP, as in other players can attack and kill your character in the game, and can get all the stuffs you are carrying...may happen that they taunt and insult you. You are right, there are a lot of angry people in the game (there are very nice ones as well of course) and it may happen that they turn your relaxation into frustration.

You can plant a totem in game and by that you get an area which is safe, no one can touch you there, and no one can destroy what you have built...but when you step out of that circle you are vulnerable.

The developers are correct and very hardworking.

I'm not sure if I'm allowed to advertise another game here, so I'll pm you about the games I'd recommend for a family.