will and trusts and LLCs

Good Morning: There is a lot of nuance in your question.  Did your mother-in-law establish and document this debt with her son on the one house?  Does he have possession of the property?  Is there any documentation in the Trust that dictates the son must pay for the home or the gift goes to someone else (in this case possibly the other brother)? If there is no language in the Trust or documentation from the mother that the son must purchase the residence from the trust, then he will likely take the property per the terms of the trust.  In short, the terms of the Trust will dictate what happens to the property in it once the grantor (in this case, your mother-in-law) dies.  If the Trust terms require the son(s) to purchase the home or it goes to someone else or the successor trustee has to sell it, then that's what will happen.  If the trust is unclear on this point and it's important to your mother-in-law, I recommend she change the terms of the trust to ensure it includes this stipulation and what will happen should the son not purchase the property from the trust.  This can be accomplished through an amendment (not recommended) or a restatement of the trust (recommended). Best wishes!