I never said that the brothers were cousins. I believe Joseph was a widower who had other children before he became betrothed to the Blessed Virgin. It’s an ancient tradition, much older than the “cousins” idea, which became popular in the 5th century. As far as your opinion on Catholic apologetics, there isn’t one ancient document, writing or statement that Mary didn’t remain a virgin after Our Lord’s birth. The tradition was held even post-reformation.
No one thinks that Mary and Joseph having relations would be sinful. But Our Lady held eternity in her womb. I think their marriage was a bit different from other marriages.
Sorry for the double post.