We had Thanksgiving at my MIL's this year and for a little background she has tons of antique and old stuff all over her house. Some of it is worth quite a bit and some is just meaningful to her because it was something someone in her family had.
My husband's aunts, uncles, cousins and their families come over for the meal if they can. We had about 20 people this year.
I've posted before about my cousin-in-law's child who gets into everything but I am so annoyed at his mother right now I could scream.
The first thing the woman did was tell her toddler to throw a ball to his cousin, it was a little bouncy ball and this was in the living room with an antique cabinet that still has it's original curved glass and inside is filled with little things that are special to my MIL for one reason or another. I told them that the kids should roll the ball and she gave me a dirty look.
A while later the child was playing on the floor and reached over and picked up a metal pot, antique of course, and I told him (nicely of course) that we shouldn't play with stuff sitting around because some of it can break and that the toys are what he should play with. She comes up behind me and asks "while is it breakable?" 
I didn't say anything but I was thinking no but it's next to a basket with a string of beads that probably isn't too sturdy that he could choke on and he could start playing with other things that are breakable. MInd you the father was sitting there when the kid picked this pot up and didn't say a word.
An hour later over desert my MIL got me really pissed too over this kid. She was telling the mother that they really should bring their child over to my child's birthday party. I had invited them to my other kid's birthday and they never showed and after much thought I decided not to invite them to the next party. The mother doesn't believe that kids should have parties until they are 13 
, even small family ones so I figure it's rude to invite her just like it's rude not to. I really don't want him over with her attitude during the Christmas season because I have lots of things that I don't want kids playing with out during the holidays even if it isn't breakable.
My husband says as much as he likes his cousin (the dad) if they were to come over that kid had better not be put down at all because everything is breakable at our house. 
Thanks for listening I just had to get this off my chest before I started smoking at the ears.
I think you should let your husband handle it since it is his family. He should speak to his cousin about his son's behavior. If they don't care about your things, you do. Hubby should speak up!
I understand how you feel about some people letting their precious children run wild in other peoples houses. I had a Christmas party one year and one of the parents let her child put a huge scratch on my brand new coffee table and not even apoligize. I was in shocked but thankfully one of our other guessed read her the riot act for letting her child destroy furniture. I told my dh that she was not comming back to my house with her children anymore. It was not an easy thing to accompllish since my husband is the godfather to one of her children. That was more than 10 years ago and she has never been invited back. If he wants to see the child he has to meet him somewhere else. I just think that some people are clueless as to the importance of other peoples property and only care about how cute their little heathens are. Just know that it is your house and your family and you get to say who comes and who is not invited. So what if she gets mad, you might have saved your sanity.If MIL insist that she come, then just have the party at MIL's house and let them have fun.
I hear ya! Our nephew (3) was drawing on the walls with crayons, markers, whatever he could find. After the third time of me telling him to stop, he threw a fit and his mother is all "oh, you POOR baby" and coddling him. The 5 year old (who lives there) was just as bad - wouldn't eat anything, demanded cereal for lunch and it was given to him. The teens are worse - they have gone through FIVE couches in the last year, due to them wrestling on them and breaking them! None of these children are like this at my house. However, I have rules, something many parents don't have anymore!
However, I have rules, something many parents don't have anymore!
I do too, I'm a terrible person I guess but my kids know how to behave even if they aren't perfect.
I talked to another cousin and he says that the mom feels that her kid shouldn't be told not to play with stuff unless it's breakable. 
And they wonder why this kid has been eating tylenol he finds and drinking hand sanitizer. I was watching this kid at my MIL's because I know what he can do and I don't want to see him get hurt or break something and I don't trust his parents to keep a good enough eye on him.
That's part of why I don't want him at my house, my kids are older than him and we have little toys and stuff around.
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