Designated decision maker in property shared by family?

[Gianni M.]

Ownership of the home I grew up in is shared 50/50 between my mom and my grandparents. It’s fully paid off and located in CA. When my grandparents pass away, the home ownership will be split 75% my mom, 25% her sister. Is there any way for my grandparents to designate a decision maker for selling the property down the road, so that we don’t run into issues if one party wants to sell before the other? I would prefer to avoid the family arguing about it and don’t want us to have to settle it in court if the situation arises. Thanks!