Okay, so my problem is that one of the people I have in my party (my brother) is VERY stubborn when it comes to playing a session of D&D, everything from getting on his tablet and getting distracted to the point where when it's his turn he has no clue what is even happening, saying things like "I punch the monster" when it is 50 feet away from him. I tried to incite a tabletop rule of "No electronics" but everytime I tell him to put his tablet away, he labels me a "Tight-ass DM" and tells me its my fault no one is having fun. What can I do about this? Is he right? Should I make changes to adhere to his rules? I have contemplated removing him from the game, but I really don't want to as he is my brother.
Is no one having fun, like he says, or is it just him?
If he's not having fun, why is he still playing?
You need to talk to him about whether or not he is really interested in playing in your game or not. Maybe he just wants to be there to hang out with friends, and could just spectate.