Give Management Access to another family member?

Is it possible for a family member to give access to all of the family members they've created over to me? I created our family tree under my ex's username, and now I need to make some changes to profiles and update, etc. but because I added them under his profile, I do not have access under my profile. Is it possible for him to give me access to editing on them on I don't have to go into his profile each time to make changes as necessary?