Roman Catechism 27.15

Chapter 27 — Part III: The Decalogue — The Fourth Commandment

Section 15. "Thy Father" — The pastor should next explain who they are, whom the Commandment designates as fathers; for although the law refers primarily to our natural fathers, yet the name belongs to others also, and these seem to be indicated in the Commandment, as we can easily gather from numerous passages of Scripture. Besides our natural fathers, then, there are others who in Scripture are called fathers, as was said above, and to each of these proper honour is due.