You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'make', Sentence: 'Jenny made the announcement that her baby was an alien.'
Solution: made
Why? The output relationship - made, is a correct verb form of the given relationship - make, and it is also used in the given sentence

New input: Given Relationship: 'be mother of', Sentence: 'Similarly , the Early Corinthian Church proclaimed the new Era by announcing to the world the Birth of the Holy Virgin Mary , who was to be the mother of Our Lord Jesus Christ , Who in turn , by His Birth , Was to bring a new Era into the world : the Era of Christianity .'
Solution:
mother