Client Portal Development in GoHighLevel

I am looking to build out the client portal within GoHighLevel to accommodate families. There will be one "master file" that is the parent and they will have multiple "sub files" that are the children. The children will be able to log in and see their own information, but the parent will be able to see all of the children's information. The parent will also be able to add new children to the master file. The project involves creating a hierarchical structure for family members within the client portal.