Says who? You? How did you get to be an authority on the sources of Catholic doctrine?
Both Jerome and Pope Damasus slapped down Helvidius over the issue, and neither one referred to Epiphanius in their refutation.
The doctrine is pretty easy to prove from the Scriptures anyway; Jesus had no right to give Mary to John if he had younger (living) siblings. Mary's question to the angel makes no sense if she planned to have relations with her husband, etc.
UNMITIGATED NONSENSE.
Vaticon a priori ASSUMPTIONS are showing again.
Jesus WAS GOD, IS GOD. HE HAD "THE RIGHT" TO GIVE HIS MOM TO THE CARE OF ANYONE HE SAW FIT TO GIVE HER TO THE CARE OF! DOH!
CUSTOM was not LAW. And there were plenty of reasons that custom and even law were sometimes made exception to. Sheesh!
If I'd had a bunch of half siblings, most of whom didn't know what to do with my unprecedented ministry and identity vs John the Beloved who leaned on my breast, getting as close to God and Paragon Love as he could . . . soaking up all that I had to give him--I'd have been foolish to have given her to LESS than John regardless of whether my siblings had been blood quadruplicates or whatever.
Sounds like Vaticon rubber logic struck again.
I have no clue where you're coming from with the illogic of Mary's question to the angel. Has nothing to do with future sexual relations with hubby fulfilling her role as wife honorably as St Paul outlined rather clearly . . . the wife's body not being her own--certainly not exclusively . . . though I gather the Vatican would have Mary disobeying Scripture on that score. What balderdash.