MZFinance.FamilyNonHoh.CannotAddPayment

What is MZFinance.FamilyNonHoh.CannotAddPayment?? I’m trying to remove 2 cards that are not mine from my account, they’re my moms, so i can add my actual cards to my account to purchase things, but when i attempt to edit and remove the cards, I get the error “ MZFinance.FamilyNonHoh.CannotAddPayment.”