Nephew using my home

[plumble]

AIBU? my nephew (27) stays at my home every 2nd weekend so he can have visitation with his 2 children. he lives over 9 hours drive away. Every time he is here something gets broken or 'lost'. Plant pots, stereo speakers, vases and remote controls etc. Then he never tells me about these things, I have to come home and discover it for myself ( which infuriates me). Now he wants to have not only his 2 children but his new girlfriends 2 children come for the weekends he is here and I have said no. He is upset and I have had his mum call me and ask me to reconsider as he wants the children to meet and have a relationship. I however cannot afford to keep replacing items that get broken, because he is too tired from driving to keep a close eye on what his children get up to. I am scared for my belongings adding more children to this situation. he cannot afford to replace these things and I have quite a few breakable things that are from my mother who passed a few years ago. I have tried putting breakables away in cupboards, but the children go through drawers and cupboards whilst dad is distracted. My home is the closest in the family to his ex partner, so I agreed to the situation. but I now regret it but also know that without this he would only see his children during school holidays. Any advice or suggestions as to what I do next would be appreciated.

Where does his mum live?

IF you were feeling really generous you could say he can camp in the garden during summer months, in the winter he will need to cut visits down so he can afford to accommodate his children. Perhaps instead of every other week he comes once during every half term, with the DC visiting him in holidays. If he is not driving so much he can maybe afford a b&b. It doesn't sound as if they are having quality time with him if he is too tired to supervise them. If he is too poor to fly there is always the night bus for about £15 each way.

Its not acceptable

What a lovely auntie you are! It sounds like you really care about your nephew and his children and have done so much to facilitate their relationship. Your sister or sister in law? Should be grateful for everything you are doing to help her son and has no right to ask more of you.

I'd suggest once a month to continue allowing them to stay in your home. This is more than generous of you.
Do have a chat with him and the children if they are old enough to understand that you wish for your home and possesions to be treated with care, and that while accidents can happen, you expect to be told and recompensed.
School holidays and long weekends he could drive them to his home for a few days and meet his step-children this way. It would be unwise to stretch your generosity further when it sounds as though resentment will soon step in and cause more damage long term than taking a firmer stance now.

I think I would write out a list of everything thats been broken or "lost" by them since this started, with prices, and show him.
He can't afford a hotel, you can't afford to be constantly replacing your belongings. Mumbling a "sorry" isnt enough, he either keeps them under control or doesnt bring them, AND he should be paying to replace what they break!