I found this article, Mary as Ever-Virgin - The Orthodox Faith and I wanted to see if anyone had any feedback on something that it said. This is one part that stood out that made me want to ask about it.
The scripture is clear that Jesus is the son of Mary, but is not clear if the other siblings are also Marys children. In Jewish culture, when a couple had children from a previous marriage, the children from the males previous marriage would be referred to as sons or daughters from the mans name. The children from the current marriage would be referred to as sons or daughters from the womans name. In this scripture, when Jesus is called the son of Mary, it would be reasonable based on the culture of the time, to imply that the other siblings were the sons and daughters of Joseph and not Mary.
Also, the Hebrew and Greek terms for brother are often used to refer to relatives and not what we would understand as brothers. For example, Abraham and Lot are called brothers in Gen 14:14 though we would understand their relationship as uncle/nephew. Jacob and Laban are also called brothers in Gen. 29:15, though we would also call this an uncle/nephew relationship. Biblical language does not always use the term brother in the same sense we do today.
In support of Mary only giving birth to Christ can be found in the Gospel of John,
John 19:26 When Jesus saw his mother and the disciple whom he loved standing nearby, he said to his mother, Woman, behold, your son!
If Jesus had other brothers, this would be a very strange situation as it would go against Jewish custom. According to custom if the oldest son died it would fall on the next oldest to take care of the mother. If the son, is the only son, it his responsibility to appoint someone else to care for the mother. Jesus, being the only son of Mary does exactly that when he delegates John to take care of His mother.