Heres a link that may add to your current understanding of the matter you seem to dwell upon if you can accept it:
And i usually take that with a grain of salt.
Do you also believe God chose the Catholic Church to put the scriptures together to provide the Bible.
That is exactly what happened.
http://www.biblestudy.org/question/did-jesus-have-brothers-and-sisters.html
I did read it and do not except it..
I do not base my belief on my bias for or against any particular religion.
The scriptures for or against Mary having other children pretty much balances out until i read john 19:26
When Jesus therefore saw his mother, and the disciple standing by, whom he loved, he saith unto his mother, Woman, behold thy son!
27 Then saith he to the disciple, Behold thy mother! And from that hour that disciple took her unto his own home.
Jesus would have no authority to do any such thing if he was not her only child and his siblings would not have excepted it if he had any..
Jesus was Mary`s only child.