How was St. Jude related to Jesus?

I am not clear about your question. However, Jude was the son of Cleophas, the brother of St. Joseph, and Mary who stood at the foot of the Cross along with Mary Magdalene and Mary the mother of Jesus, and who anointed Christ's body after death. He was the brother of Saint James the Lesser. That makes him a nephew of Mary and Joseph and first cousin of Jesus Christ. He is said to have looked a lot like Jesus.