in-laws always overstaying their welcome. advice?

So my husband has a brother and sister. I grew up pretty much as an only child. My husband is a very social person and loves to have people over, get togethers etc. I don't mind doing them every now and then but he is the one who pushes for it. My main problem though is that every time we have a party his brother and sister have to spend the night and stay the whole of the next day (in the past sometimes the whole weekend but I had put a stop to that). Mind you they do live about 45 mins to an hr away depending on traffic (although if i was in their place I'd still rather drive an hr home). Anyway once again here we are, its 9:30 pm and I am exhausted after hosting a NYE party last night but they are still here at my house. I feel like I can't really relax when I still have guests and I feel like every party turns into a sleep over. Also Sundays are usually when I get to relax and spend quality time with my husband or do household chores, shopping etc which is hard to do with them here. On top of it all they don't help with anything unless my husband specifically asks them to do something. The house was filthy this morning after the party but they don't ask if they can do anything to help, just leave their dirty dishes in the sink after we have already cleaned up, etc. I have spoken to my husband about this and he has spoken to them ( hence why they don't stay for days anymore) but I feel like it's slowly going back to the same thing and my husband likes the company I guess and having his brother to play video games with ( mind you he is almost 40). Am I being ridiculous? Maybe since I didn't grow up with siblings in this way or don't have siblings to come over and visit I am being unreasonable? Any advice is appreciated.