What can we do if 4 out if the 5 sibling(beneficiaries) agree to the distribution of the estate. Two of the 5 are co-executors .

There is a living trust . The two brothers are co-executors . They saw an estate attorney to get things started. The attorney advised them how to honor my mom's written wishes for specific items. Now one of the executors does not want that done because it mostly benefited the girls with jewelry . He wants everything appraised and wants us to buy it. He won't answer emails or ph calls. We fear he is acting on his own as we found out he had an estate sales person over to the house. Any advice is greatly appreciated Thanks Cindy