"And when He came into His own country, He taught them in their synagogue, insomuch that they were astonished, and said, Whence hath this man his wisdom, and these mighty works?
Is this not 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?
And they were offended in Him. But Jesus said unto them, A prophet is not without honor, save in his own country, and in his own house."
Matthew 13:54 - 57
These were Jesus' hometown folk, these were His next door neighbors...they knew Him, or more accurately they knew of Him, (they didn't realize that He was God in the flesh) and they knew His family, personally.
The historical record of scripture bears witness that Joseph and Mary had children. These were the half siblings of Christ.
Not to say that Mary wasn't blessed, scripture speaks plainly that she was, not to say that Mary wasn't a virtuous woman and a vessel used by God, again scripture indicates that she was.
But the idea of her perpetual virginity is flatly contradicted by scripture.
Even so, even though she knew Joseph, she was still virtuous even though she was born with a sin nature, which makes her life more amazing: Marriage is honorable in all, and the bed undefiled...Hebrews 13:4
Intercourse between husband and wife has been declared to be holy by God, just as holy as a lifetime of chastity.
You have not proven this with your post nor by the scripture you quote. Jesus himself said being celibate is better than being married and Paul concurred with this, but only few have this grace. God has done great things for Mary by her own words and I don't know why she wouldn't be graced with this charism.
You are making a huge assumption, no pun intended, by stating that Mary was an ordinary wife which is not based in scripture nor the circumstances surrounding the Incarnation, life, death, Resurrection, etc... of Christ.
Also, the Mother of God was not born with a sinful nature but that is a lengthy discussion for another time.
And I owe you a thank you for the cordial discussion.