Not sure how many realize he was from large family and so where are they now?

Mar 6:3
(3) Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him.

what happened to the blood line, as if Matthew's genealogy is correct, we still have an heir to the line of David?