The Catholic stance is that Mary required forgiveness of original sin because she shared blood and flesh with Christ for 9 months.
Who amongst Mary’s foremothers can claim the same?
I am not espousing a single theological belief, FRiend. I am explaining the differences between beliefs, according to what I have personally endeavored to understand.
Then he Catholic church doesn't really understand the mechanics of pregnancy.
They do not share flesh, as the baby is a separate entity from the mother.
They do not share blood, as they each have their own circulatory systems with the baby as likely as not, having a different blood type than the mother.
Besides, the body is not the spirit or soul. The body is corrupted by the sinfulness of the soul, but the sin originates in the heart long before it's acted out in the body.