Trust litigation is similar to probate litigation, except that it relates to a trust rather than a will. Like a will, the validity of a trust may be challenged if it wasn’t properly formed, if the grantor lacked the legal capacity to create the trust, or if the trust resulted from undue influence, coercion or duress. Similarly, a trustee may be subject to removal for malfeasance, just as an interested party may petition to remove a personal representative who is breaching his or her fiduciary duty.
While probate litigation is an adversary proceeding opened in an existing probate case, passing property through a trust doesn’t require involvement of the probate court. Thus,  challenging the validity or administration of a trust requires initiating a lawsuit.