The phrase "sole custodian" means that someone has full and complete responsibility for taking care of something or someone. They have exclusive authority and control over that thing or person. Full definition
Few stay - at - home moms can flip a switch and become primary breadwinners and sole custodians of the children overnight. (altshulerlaw.com)
The terms and conditions for deposit, withdrawal of funds, execution services, margin trading, or access to your account will be governed by IB in its role as sole custodian and broker. (foolwealth.com)
When a parent has only visitation, a court may order the address and contact information of the child's sole custodian redacted for safety purposes. (divorcesource.com)