The Bible says no, but many believe that he did.
Does Jesus have Biological children?
I doubt it. I am pretty sure that he was homosexual. He never married and hung mostly with other guys, and John was a young boy. He was in the Roman Empire and you how they liked young guys. So it would have been the norm for his society to be into boys. His interest in girls is never mentioned. Maybe he was bi and knocked up Mary Magdalene, but I doubt it. I know that she was kind of a whore, but I think he just was friends with her. I'm pretty sure he was only into boys.
Yes, he did. Just as he had biological brothers and sisters .
According to bible there's none
Nobody knows because nobody from the past has ever live but we have our literature which is a witness from the past so we will believe what it state and it state that Jesus have no siblings so we've got to believe it!