Except when she's not. And considering she stole a key and broke into his place, I'd say she's definitely not welcome. Also, if he doesn't want his grandmother (or any other relative) in his place, that's his right.

She is always welcome as long as she give a heads up that she is coming. I would be pretty pissed if someone goes in my house with out knowing it

#1 I get what you're saying, my grandmother has been gone for 15 years so if I walked into my house and I saw her standing there, after I had the heart attack that this would definitely cause, I wouldn't mind how she got in and would spend the day answering whatever questions she wanted to ask. However, in normal everyday situations I would probably be pretty upset with any family member who 1, stole my emergency key from my mother for something that was not an emergency and 2, for not respecting me, my home, and my privacy enough to not call and make sure that this would be okay for them to do. To me it sounds like that's exactly what the problem is for OP, not the fact that the grandmother came to visit. OP, good luck with your grandmother and her boundary issues. Maybe you should also mention to your mother that she should find a more challenging hiding spot for your emergency key.

but wouldn't his mom have to get another key and if she does get another key his grandma can just steal that one.

Locks are not that cheap

I missed the part where OP said it was his birthday... Trespassing is trespassing. Grandmother or not, she shouldn't have invited herself over, especially not without asking.

Just cause she is your grandmother doesn't give her the privilege to do what ever she wants. There is still this thing called privacy

^i think this was meant to be sarcastic, man

Literally says in the FML that she got it from the mother.

I think they were asking what story / reason the grandma gave the mom to get the key.

I meant that as payback for what the grandma said to him.

If she does, I'd be even more worried because she walked/drove herself to his house....

Oh yeah, I forgot about those increasingly-popular first come first serve wills. Asshole...

That's how my dad's doing it. My brother and I agreed that I get the computer and he gets everything else

You want to inherit a computer? It'd lose value and functionality quicker than anything else. Pick something else to inherit.