Who is the mother of the mother of the first grand child Demon of Screamin?

The "Demon of Screamin'" is a nickname for Steven Tyler, the lead singer of Aerosmith. His first grandchild is the child of his daughter, Liv Tyler. Therefore, the mother of Liv Tyler is Bebe Buell. Thus, Bebe Buell is the mother of the mother of Steven Tyler's first grandchild.