Legal Question in Wills and Trusts in Illinois

Can one of four . . . : no unless the trust provides for it on those terms.

Can he force us to sell . . . : you're talking about the possibility of a "partition" action where there is a deadlock but with 4 people the majority may rule. Part of it may depend on who holds power of direction over the trust if a land trust, or who the trustee is if a living/testamentary trust. Take the trust agreement to a lawyer like me who does real estate and related work for review and full assessment of your options.