Mil problems.

Okay, i just need someone to tell me if I’m in the wrong, my SO and I have been arguing all day, he left on thanksgiving to go fish, and didn’t want to stay home and enjoy the time we have for it, we just had a baby so it was her first, anyways I let his mom move in for a while, because I wasn’t going to let her be homeless, and I asked him if he would come here, so I could ask him something, and she said “you really need to give him break” but it wasn’t in a nice tone, it was more rude sounding. I’ve always been nice to her and she’s been nothing but having a attitude, since she came. I told him she shouldn’t be getting in our business and I wasn’t going to be as nice I was when I answered her back and he keeps saying I’m in the wrong??