Leander, TX Estate Planning Law Firms & Lawyers

Children are not responsible for the unknown debts of their parents. Your father's estate will be responsible for his debts and your mother could be responsible for your father's debts.

If the land is in a trust, you do not own it:  the trust does.  The trustee decides whether to sell the land.  The beneficiaries (apparently your husband and his two siblings) do not. If a trustee is not putting the interests of the beneficiaries first but is putting his own interests first, the beneficiaries can sue to have him removed.  But whether selling or not selling the land is putting the beneficiaries first is a big question.  You may want to take a copy of the trust agreement to a lawyer who does fiduciary litigation and discuss the specific facts.  

Generally, if a trust is created while the trustor has capacity and is not under undue influence the trustor can make whatever plan of distribution he or she sees fit.