In the past until the 1990s in Sungai Liuk mamak had the obligation to carry out a ceremony when the niece of the first daughter of her sister married, namedmulo cucu ayae ceremony. But nowadays that role of mamak in the implementation of mulo cucu ayae ceremony has undergone a change. The approach used in this research is a qualitative. The selection of inforants were done by porposive sampling, and the data were analyzed by the techniques of Milen and Hubermes. The results indicate that the role of mamak in the mulo cucu ayae ceremony has undergone a change of role. The role is replaced by father of orang sumando. The role of mamak in mulo cucu ayae ceremony in the past until the 90s (1) Responsible for carrying out mulo cucu ayae ceremony; (2) Coordinating fundraising for mulo cucu ayae ceremony; (3) Preparing equipment for the implementation mulo cucu ayae ceremony, now there is a change in the role of mamak in the implementation mulo cucu ayae ceremony in Dusun Sungai Liuk, such as (1) Educational factor; (2) Economic factor; (3) Factor of heirloom that have been sold; (4) Overseas factors; the occurrence of the change in the role of the mamak during the mulo cucu ayae ceremony in Sungai Liuk; (1) The figure of mamak is less respected by nephews; (2) The authority of mamak begins to fade in the midst of society and sumando (3) Changes in structure and responnsibilities in the family; (4) Conflicts faced; (5) Conflict of inheritance.