Yes. You may use an Account Alert which applies to the family as a whole. To note something about a particular person you may wish to use the Comments field on their Person Information screen.
An Alert icon (yield sign) will appear when the family is displayed at the main screen of Family Data (upper right). Hold your mouse over the yield sign to view the alert. This is designed to alert you of things such as: “Do not accept checks, MONEY ORDERS only!” or “Linked to Mary Smith, divorced. Mary is the mother and Bob is the father.”