How to deal with moody teenage son?

Ch

My son is 13 and is driving me mad with his rudeness. I've blocked his gaming on the Xbox, due to his mood swings and lack of cooperation. He has threatened to kill himself if he doesn't get it back but I think he is bluffing. I've tried talking to him in a adult way and he is defensive saying "I'm trying to control his life and not giving him any freedom". My Mother died suddenly 13 months ago and I found her body which was traumatic to say the least. I'm still grieving and I feel I've let him down by giving him too much freedom playing Fortnite. On the plus side his grades are still going up, but it's his disrespectful attitude that's killing me. It has affected the whole family. Any word of advice would be much appreciated! I'm not sure if I'm posting this in the right group chat as I'm new to Glow. 😔