As far as mama and papa are4 concerned, the story says the only thing special about Mary's birth was that she, like my daughter, came after much hope, much sorrow. Her parents may have been blessed with many graces but they were not sinless and their union was more (and no less) sinless than that of any chaste and pious married couple.
Praise God for some sane assertions about that on the part of an RC. Yea!