First, there is a big difference between the use of Mother of God and mother of my Lord. Mother of God is a proper noun while mother is a common. God is Yahweh, I am who I am, the Greek for Lord in this verse is master, not LORD as in Yahweh.
Second, do you not remember when Christ on the Cross rejected His mother’s claim to Him? In a sense, transferred such mothership to John? He wanted to ensure no one would deify or worship her. She was just as human as the rest of us.
Third, you are taking that commandment out of context. The son or daughter is commanded to not curse the father or mother. I am not the son of Mary.
18“What profit is the image, that its maker should carve it,
The molded image, a teacher of lies,
That the maker of its mold should trust in it,
To make mute idols?
19 Woe to him who says to wood, ‘Awake!’
To silent stone, ‘Arise! It shall teach!’
Behold, it is overlaid with gold and silver,
Yet in it there is no breath at all.
20 “But the Lord is in His holy temple.
Let all the earth keep silence before Him.”
Habakkuk 2
Point of order: The Tetragrammaton never occurs in the Greek New Testament. It is consistently rendered following Masoretic convention as kyrios, even in places where it quotes the Old Testament (Romans 9:29, for example, quotes Isaiah 1:9 and translates it with kyrios, not the Tetragrammaton.)
In your unlearned opinion
Second, do you not remember when Christ on the Cross rejected His mother’s claim to Him? In a sense, transferred such mothership to John?
If Joseph and the Blessed Mother had had other children as you erroneously claimed, then why would Christ entrust the care of His mother to someone other than a sibling? Especially since He condemned the Pharisees for neglecting to care for their parents; the Korban rule, in Matthew 15?
Third, you are taking that commandment out of context.
In your unlearned opinion.
I am not the son of Mary.
John was not the son of the Blessed Mother. John was the son of Zebedee and Salome and the brother of James the Great. Why entrust the care of His mother to someone who was not her son?
Is God your biological father?