The equalization of Mary's motherhood to all Christian Mothers. Luke 8: 20,21
Not all mothers, all virtuous mothers.
One verse does not negate the others, especially the role of Mary alone combatting the Devil on behalf of her multitude of children in Apocalypse. Also note that "they who hear the word of God, and do it" is a tall order that does not get met by everyone to the same degree as Mary. But, yes, we all should reach to sanctification, -- that is Catholic teaching. This is why we venerate all saints, not just Mary.
I would say you don't know that two elephants are still both elephants even if one is big and the other little. All who do the will of His Father are mother and brother and sister, yep. But certainly this is not true in all respects, since not all were greeted by Gabriel or embraced By Elisabeth, not all gave Him birth and suckled Him. Not all were in the upper room on Pentecost. Many can be saints. Not all can be the pre-eminent saint.