EWTN.com - Mary: "Mary
Does the catholic faith believe that the Virgin Mary had children with Joseph after Jesus was born? Did Jesus have half brothers?
Also, what is purgatory? Do only catholics believe in purgatory?
Answer by Fr. John Echert on 9/6/2008:
Mary was and remains Ever-Virgin, which means that she never had children by any normal means, before or after Jesus, and Jesus Himself was conceived by the Holy Spirit. So there were no siblings. References to 'brothers' and 'sisters' in the Gospels are easily accounted for by the custom of the time to use one word in the Hebrew and Aramaic for siblings and kinfolk--cousins, etc.