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.
Q: Given Relationship: 'be son of', Sentence: 'If James was son of this William , he may have been born in Canada and because of stigma of being son of a Loyalist , changed the spelling from PEAVEY to PEVA upon coming to the U.S. James named his youngest son William .'
A:
son