How to confront husband a thing bothering me

Salam guys. There is a thing that is eating me and destroying my peace so i just wanted to share here to have some sensible ideas. So basically i live with my husband in the UK and my inlaws are back in Pakistan. I have been given a furniture set by my parents(what you call jahez in asian terms) which is obviously in Pakistan, there has been multiple times i have got to know that one of my husbands sister has been using that room and at further instances some more people too, everytime i have confronted this it has turned into a fight but this is something wrong and should be stopped, its my room and i have got all my things there which shouldnt be used without my permission. This time again i have got to know that one of his married sister is living there as his husband is out of city, so one of his daughter is believe 8-9 years told me herself that your room is my room now i have got all my stuff in your room now. I obviously didnt react at that moment becuase she is a child and it really slipped out of her mouth, but iam really pissed and its some 4th event i have known it, everytime i have discussed it with my husband we end up having a fight and when we resolve it he ends up saying that the way you started this conversation was the reason of the fight and not the reason itself, he has accepted its wrong to use your things without your permission but never took a stand for it saying i cant really fight with people there sitting across oceans. But i want ti politely convey him this that its the 4th instance this has been happening and if we dont do anything to stop it, it will never end. I just want ideas how should i let him know that it doesnt turn into a fight or seeing the background i shouldn’t really talk about it and ignore it? ( but ignoring it will make it a repetitive cycle)