Yes, Jesus Christ was born of a virgin, Mary. She was betrothed to Joseph at the time, but the scriptures say that he never physically joined with her until after the birth of Christ, her firstborn. "Then Joseph being raised from sleep did as the angel of the Lord had bidden him, and took unto him his wife: And knew her not till she had brought forth her firstborn son: and he called his name JESUS." (Matthew 1:24-25).

     Therefore, Joseph was the stepfather of Jesus Christ, not his father. Mary was, however, the mother of at least six other children. Joseph was most likely the father of all Jesus' half brothers and sisters. This is evident in the following scriptures and lack of divorce at the time. "Is not this the carpenter’s son? is not his mother called Mary? and his brethren, James, and Joses, and Simon, and Judas? And his sisters, are they not all with us? Whence then hath this man all these things?" (Matthew 13:55-56)

     Yes, Jesus Christ did have siblings. He grew up in a home full of children and saw all that went on in that home. This in no way takes from the fact that He is God. It does, however, give us a better understanding of His humanity. Jesus Christ is still as it says. "The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world." (John 1:29).