George IV, Count of Erbach-Fürstenau
George IV, Count of Erbach- Fürstenau( 12 May 1646 – 20 June 1678), was a member of the German House of Erbach who held the fiefs of Fürstenau, Michelstadt, Reichenberg, Bad König and Breuberg.
Born in Hanau, he was the eighth child and fifth( but third surviving) son of George Albert I, Count of Erbach- Schönberg and his third wife Elisabeth Dorothea, a daughter of George Frederick II, Count of Hohenlohe- Waldenburg in Schillingsfürst.
Frederick Magnus, Count of Erbach-Fürstenau
Frederick Magnus, Count of Erbach- Fürstenau( 18 April 1575 – 26 March 1618), was a German prince member of the House of Erbach and ruler over Fürstenau and Reichenberg.
Born in Erbach, he was the third child and second( but eldest surviving) son of George III, Count of Erbach- Breuberg and his second wife Anna, a daughter of Frederick Magnus, Count of Solms- Laubach- Sonnenwalde.
He was named after his maternal grandfather.
Louis I, Count of Erbach-Erbach
Louis I, Count of Erbach- Erbach( 3 September 1579 – 12 April 1643), was a German prince member of the House of Erbach and ruler over Erbach, Freienstein, Michelstadt, Bad König and Wildenstein.
Born in Erbach, he was the seventh child and third( but second surviving) son of George III, Count of Erbach- Breuberg and his second wife Anna, a daughter of Frederick Magnus, Count of Solms- Laubach- Sonnenwalde.
George Louis I, Count of Erbach-Erbach
George Louis I, Count of Erbach- Erbach( 8 May 1643 – 30 April 1693), was a German prince member of the House of Erbach and ruler over Erbach, Freienstein, Wildenstein, Michelstadt and Breuberg.
Born in Fürstenau, he was the fifth child and third( but second surviving) son of George Albert I, Count of Erbach- Schönberg and his third wife Elisabeth Dorothea, a daughter of George Frederick II, Count of Hohenlohe- Waldenburg in Schillingsfürst.
George Albert I, Count of Erbach-Schönberg
George Albert I, Count of Erbach-Schönberg (16 December 1597 – 25 November 1647), was a German prince member of the House of Erbach and ruler over Schönberg, Seeheim, Reichenberg, Fürstenau and since 1643 over all the Erbach family lands.
Born in Erbach, he was the fourth child and second (but eldest surviving) son of George III, Count of Erbach-Breuberg and his fourth wife Maria, a daughter of Count Albert X of Barby-Mühlingen.
George August, Count of Erbach-Schönberg
George August was the Count of Erbach- Schönberg and lived from 1691 to 1758.
He was the youngest son of George Albert II, Count of Erbach- Fürstenau to reach adulthood.
George III, Count of Erbach-Breuberg
George III, Count of Erbach- Breuberg( 15 July 1548 – 26 February 1605), was Count of Erbach in Lauterbach and Breuberg.
Born in Erbach, he was the fifth and youngest child but only son of Eberhard XII, Count of Erbach- Freienstein and Margareta, a daughter of Count Philipp of Salm, Wild- and Rhinegrave of Dhaun.
George Frederick, Count of Erbach-Breuberg
George Frederick, Count of Erbach-Breuberg (6 October 1636 – 23 April 1653), was a German prince member of the House of Erbach and ruler over Breuberg.
He was the eldest child of George Albert I, Count of Erbach-Schönberg and his third wife Elisabeth Dorothea, a daughter of George Frederick II, Count of Hohenlohe-Waldenburg in Schillingsfürst.
John Casimir, Count of Erbach-Breuberg
John Casimir, Count of Erbach- Breuberg( 10 August 1584 – 14 January 1627), was a German prince member of the House of Erbach and ruler over Breuberg, Wildenstein and Fürstenau.
Born in Erbach, he was the eleventh child and fourth( but third surviving) son of George III, Count of Erbach- Breuberg and his second wife Anna, a daughter of Frederick Magnus, Count of Solms- Laubach- Sonnenwalde.
George Albert II, Count of Erbach-Fürstenau
George Albert II, Count of Erbach- Fürstenau( 26 February 1648 – 23 March 1717), was a member of the German House of Erbach who held the fiefs of Fürstenau, Schönberg, Seeheim, Reichenberg and Breuberg.
Born in Fürstenau, he was the ninth child and sixth( but fourth surviving) son of George Albert I, Count of Erbach- Schönberg and his third wife Elisabeth Dorothea, a daughter of George Frederick II, Count of Hohenlohe- Waldenburg in Schillingsfürst.
He was born three months after his father's death, on 25 November 1647.

Question: Who is George Frederick, Count Of Erbach-Breuberg's paternal grandfather?
Answer: George III, Count of Erbach-Breuberg