You dont want to use scripture ey? Ok, Ill play your game. Is David the father of God?
He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: (Luke 1:32)
And all the people were amazed, and said, Is not this the son of David? (Matt 12:23)
And, behold, a woman of Canaan came out of the same coasts, and cried unto him, saying, Have mercy on me, O Lord, thou son of David; my daughter is grievously vexed with a devil. (Matt 15:22)
And, behold, two blind men sitting by the way side, when they heard that Jesus passed by, cried out, saying, Have mercy on us, O Lord, thou son of David. (Matt 20:30)
And the multitudes that went before, and that followed, cried, saying, Hosanna to the son of David: Blessed is he that cometh in the name of the Lord; Hosanna in the highest. (Matt 21:9)
Again, is David the father of god?
LOL!!
Touche`
Is Jesus God and is Mary His mother?
Simple questions. I would think you could answer them.
Why? Because Jesus is God.
That doesn't mean they are "sources of the Godhead" or "older than God" or 'gods' themselves, or quasi-supreme-beings or any such thing. They are just finite creatures, made of dust. Jesus is infinitely superior to them, by virtue of His God-nature. "The Lord said to My Lord, sit at my right hand, until I make your enemies your footstool." David, Christ our God's father (ancestor), calls Him Lord.
Jesus has human ancestors going all the way back to Genesis, where God told the serpent that there would be "enmity between you and the woman, between your seed and her seed" and we know who triumphs in the end!
So this is what you have to wrap your head around: that God is eternal, totally sovereign, the Creator of all things visible and invisible, including all human creatures, including of course all His ancestors, and that a human creature Mary, overshadowed by the power of the Holy Spirit, gave birth to a Son, who was (and is) God.
So that makes Abraham the Great43 Grandfather of God. Yet Jesus Christ, the Eternal Word of the Father, rightly says "Before Abraham came to be, I AM."
Or should Mary's parents be called the grandparents of God?
At best it violates the continuity of terminology with the language of Scripture, and exalts Mary above what is written, and at worse it conveys that she is ontologically the mother of God. In regards to the first what even Ratzinger said concerning Co-redemptrix should be applied.
Co-redemptrix departs to too great an extent from the language of Scripture and of the Fathers and therefore gives rise to misunderstandings Everything comes from Him [Christ], as their Latter to the Ephesians and the Letter to the Colossians, in particular, tell us; Mary, too, is everything she is through Him. The word Co-redemptrix would obscure this origin. A correct intention being expressed in the wrong way. For matters of faith, continuity of terminology with the language of Scripture and that of the Fathers is itself an essential element; it is improper simply to manipulate language. Source