Congrats on subsidizing the other kids... sucks as I've seen this a bunch of times.

Unfortunately, this needed to be treated as a "business" from the outset (signed lease, etc.) especially if the other family members are using the asset and not paying. In a nutshell, if the two of you are trustees, you have a "responsibility" to look out for all beneficiaries of the trust. If the other trustee(s) are OK with the lack of revenue, they are in breach of that duty. Have to have something to hold feet to the fire in cases of non compliance. Nothing like a business with family... kills a bunch of goodwill most of the time.

There is usually language regarding sale of assets and whether the trustees must agree on the sale, etc. Seen so many where there are 2+ trustees and all it takes is one of them to say, NOPE, and everything comes to a screeching halt.

Maybe look for a legal aid help service in the area that could help with answering your question. Most attorneys will provide a consultation for free, might be another course of action.

Good luck