My husband and I would like to sell our land, however, it is in a trust with his 2 sibblings with undevided interest. We own 3/4 of the land...

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.