In law problems

Ok so I’m not in any way trying to be rude or ungrateful but I just needed to get this off my chest. So my boyfriend and I just recently moved into our actual house, it’s been about 3 weeks. There’s been two different occasions where my boyfriends brother let’s call him A and sister let’s call her B have come over unannounced cause my boyfriends parents are over to. The first occasion I didn’t mind it till B’s son broke the one and first decoration we had bought for our house. It broke my heart but I didn’t say anything. Second time everybody parked on my front lawn and drank for hours. (nothing against drinking just not what I planned to do on a Friday after a double shift.) I knew once we got our place we’d have them over every once in awhile but things started coming up like people opening my kitchen cabinets (which I hate), scratching up my floors, locking up my dog outside and breaking his toys. I talked to my mother in law about it cause we get along better. I tried to explain that I liked to take care of my things I was raised that way to take care of things and they’ll last longer. I just didn’t know how to explain it to them that I didn’t appreciate the way they are at my house. She dismissed me as being sensitive. I hate this me and my boyfriend work hard for the things we have I may be special and i may like nice things but we have nice things cause we work hard. I’m not materialistic I just don’t know how to tell his family to be a little more respectful. Any advice? Am I wrong?

Ok little update! I tried talking to my boyfriend REPEATEDLY! We literally have fights about it! I talked to my mom and it made her all types of mad get that she’s worse than me when it comes to her house! This has been bothering me so much i talked to my family like my grandma and dad. We talked about how our home literally has nothing but a couple of pieces of furniture that were given to us how are they going to treat the things we actually are saving up for. I talked to his mom and I told her that everyone has a strict rule in their house that I have respected and now I’m going to have some of my own. I’m not being special I just want a little more respect of my home and my things! That should go without saying! Now idk how I’ll tell them nicely. And without coming off mean or rude! Any advice?