Disowning Family Members

Ancient history now, dad died in 2006, his will stated that it was to be divided equally between his 4 kids, and his wishes were respected.
My mom has remarried and her husband has kids as well, who are also very difficult to get along with, so I fully expect more problems then.
That's the true spirit of a will and or trust. RESPECTING THE OWNERS WISHES. A trustee or designated person has a fiduciary responsibility to their mother, fathers or "owners" final wishes and to the beneficiaries. A trustee or person should act as if they were standing in the owner's shoes and act in cooperation with the will or trust documents. BUT some always seem to think it is theirs and act only or at least in part for personal gain. That's when everything goes awry.