Archbishop Lucas offers insights on the US Catholic Catechism for Adults Chapter 28:

The Fourth Commandment deals with all aspects of family life—parental and filial duties and responsibilities, that is, those of love from child to parent. This includes the duties of children toward their parents, the duties of brothers and sisters toward each other, and the responsibilities of adult children toward their older parents. This Commandment also addresses the duties of government and the duties of citizens (cf. CCC, nos. 2234-2246), including the responsibility of the state and society to foster family values and to strengthen the family in every possible way.

United States Conference of Catholic Bishops (USCCB)