Mary is simply human. Jesus is not "simply human". Jesus is a single divine person, having a human nature (which he received from Mary, his mother) and a divine nature (which he has eternally), which were united in one hypostasis at the Incarnation. He is God. Mary is his mother. Mary is therefore the Mother of God.
BTW, certain Orthodox liturgies refer to Mary's parents as "Joachim and Anna, the holy and righteous ancestors of God".
You say: “Mary is therefore the Mother of God.”
According to scripture, Jesus had 4 brothers, and Mary had at least 7 children.
Do you also call Jesus’s brothers - “Brothers of God” ???
Sorry, Mary is Not “Mother of God”!
This title is not given in Scripture!