AITAH for telling my sister-in-law that her boyfriend needs to move out of the house.

Well, I haven’t told my wife and her sister yet that the sister's boyfriend needs to move out. I want to cross my Ts and dot my Is, legally speaking, first. Nonetheless, here is the situation:

I (40m) bought a house with my wife while I was living overseas. My wife allowed her sister, 2 kids, and the sister’s boyfriend to move into the house with her since I wasn’t living there. The boyfriend (30m) quickly claimed the garage and made it his “man-cave.” My wife didn’t care, as she never went to the garage.

When I say he made it his man-cave, I mean that he stays down there all day and often sleeps there. He will come out to go to work, unless he has been laid off, go to the bathroom, and raid the refrigerator since he doesn’t eat meals with the family.

After being overseas for almost 3 years, I have lived in the house for nearly 2 years now.

On my wife's wishes, I have looked into buying a second home. That way, they could rent one of the homes from us, which would also provide me with the space in my own house that I need. While we were looking at houses, I allowed him the garage.

It turns out that we can’t buy a second house because after agreeing to pay $700 a month in rent, they have consistently fallen short by $200 - $400 a month.

8 months ago, I brought home a motorcycle and told him that he needed to make room in the garage for me to be able to rebuild it. He agreed to this. Unfortunately, he never followed through and continued to sleep in the garage.

So mid-December I told him he needed to move his stuff out of the garage and I gave him a 3 week time frame, well we are now well over a month and a half past that due date.   

He has told me that he stays in the garage because he doesn’t like living here. He has also said that he will remove his stuff from the garage, but he has yet to follow through. He is upset that he has lived here for “this long,” and he doesn’t know why everything has to change now. He tells me he doesn’t have a place to put his stuff and that his family will move out soon. (Despite not actually having a time frame.)

I have pointed out that he can simply pack his stuff in boxes and stack it in a corner since he is “moving” anyway or that he can get a storage unit like I had to because his family is taking up 3 bedrooms and my garage.

His answer to this was to threaten to kick my ass and to tell me to talk to my sister-in-law because he doesn’t want to talk to me.

There is obviously more to the story but those are the basics. If more details are needed let me know I will provide them.

Finally, my first inclination was to let him off with a warning and that under no circumstances should he ever threaten me again because I would go to the police if it ever happened again. However, after sleeping on it I am leaning toward removing him from the property now. My reason is simple; I wouldn't tolerate him threatening violence against anyone else in the house, so, in that train of thought threatening me should be no different.