Jesus did not need to have a sinless, immaculately conceived mother in order to be perfect Himself. Otherwise, this brings the infinite regression problem. How could Mary be immaculately conceived unless her parents were also sinless? And if Mary and Mary's parents were immaculately conceived/sinless, then why not also Mary's siblings (if she had any?) Why not Mary's cousin Elizabeth, and her son John? My not trace this immaculate ancestry back to Adam's son Seth?
And, if every person going back to Adam's son Seth was immaculately conceived and born sinless, then why did we need a Savior in the first place?
Jesus loved his mother personally, as a son loves his mother, and--more than that--loved her as a Creator loves His Creation. But he did not put too much emphasis on her identity from a theological perspective; she really isn't a star character is the gospel narrative. When Jesus was told, "Your mother is here to see you" he answered, "Who is my mother? ...Whosoever does the will of my Father in heaven is my brother, and sister, and mother?" (Matthew 12)
Jesus referred to his disciples as his brother, sister, and mother. Elsewhere, the Church is referred to as the Bride of Christ. We are also called the Body of Christ (His hands, His feet, etc.). And Proverbs 7 says that we should call Wisdom (personified as a female) as our sister. And, Matthew 23 says "Do not say any man on earth is your father, for G-d is your Father", apparently addressing those who would call themselves priests and popes centuries into the future.
As Protestants, we don't take apostolic succession seriously; we don't say that one person took the place of another disciple, or that somebody has a legitimate claim to a throne passed down from Peter. What did Paul say about this? "It has been declared unto me... that each one of you says, I am of Paul, and I am of Apollos, and I am of Peter... seriously... knock it off" (1 Cor 1). Likewise, we don't revere Jesus' human relatives as divine or immaculate, certainly not sinless (other than by the divine decree of G-d washing away their sins... lest any man should boast). To do otherwise reeks of idolatry and paganism, and takes the rightful place of the Disciples and the Church as a whole, acting as his mother, brother, bride, etc.