Q. 1. What is the meaning of "sister churches?" Does it mean different parishes in a Diocese?

A. 1. "Sister churches" is the term used to refer to different denominations of the non-Catholic churches. They are sisters to each other. An example is the Anglican Church is a sister church of the Lutheran church.

Non-Catholic churches cannot be sister churches of the Catholic Church. The Catholic Church and the Rites in communion with Rome are called the "Mother Church." The Catholic Church came first; the others were breakaways from the Catholic Church.