Is it true that John the Baptist was Jesus’ cousin?
Short Answer: Yes.
Longer Answer: Yes it is true, though it could be in a somewhat looser sense than we often mean. The Greek word that described the relationship of Mary, Jesus’ mother, and Elizabeth, John’s mother, indicated that they are relatives, but doesn’t get too much more specific. Exactly what degree of cousin or how far back their ancestral connection goes, it is hard to say.