Christian I, Duke of Saxe-Merseburg
Christian I of Saxe-Merseburg (Dresden, 27 October 1615 – Merseburg, 18 October 1691), was the first duke of Saxe-Merseburg and a member of the House of Wettin.
He was the sixth (third surviving) son of Johann Georg I, Elector of Saxony, and his second wife Magdalene Sibylle of Prussia.
Christiane of Saxe-Merseburg
Christiane of Saxe- Merseburg( 1 June 1659 – 13 March 1679), was a German noblewoman member of the House of Wettin and by marriage Duchess of Saxe- Gotha- Altenburg.
Born in Merseburg, she was a child of Christian I, Duke of Saxe- Merseburg and his wife Christiana of Schleswig- Holstein- Sonderburg- Glücksburg.
Christian II, Duke of Saxe-Merseburg
Christian II of Saxe-Merseburg (19 November 1653 – 20 October 1694), was a duke of Saxe-Merseburg and member of the House of Wettin.
He was the second (but eldest surviving) son of Christian I, Duke of Saxe-Merseburg, and Christiana of Schleswig-Holstein-Sonderburg-Glücksburg.
Philipp, Duke of Saxe-Merseburg-Lauchstädt
Philipp, Duke of Saxe- Merseburg- Lauchstädt( 26 October 1657 – 1 July 1690) was a German prince.
He was a member of the House of Wettin.
He was born in Merseburg, the fifth but third surviving son of Christian I, Duke of Saxe- Merseburg and Christiana of Schleswig- Holstein- Sonderburg- Glücksburg.
Sophie Hedwig of Saxe-Merseburg
Sophie Hedwig of Saxe-Merseburg (4 August 1660 - 2 August 1686), was a German noblewoman member of the House of Wettin and by marriage Duchess of Saxe-Saalfeld.
Born in Merseburg, she was a child of Christian I, Duke of Saxe-Merseburg and his wife Christiana of Schleswig-Holstein-Sonderburg-Glücksburg.
Maurice Wilhelm, Duke of Saxe-Merseburg
Maurice Wilhelm, Duke of Saxe-Merseburg (5 February 1688 – 21 April 1731) was a duke of Saxe-Merseburg and member of the House of Wettin.
He was born in Merseburg, the fifth (but second surviving) son of Christian II, Duke of Saxe-Merseburg, and Erdmuthe Dorothea of Saxe-Zeitz.
August, Duke of Saxe-Merseburg-Zörbig
August, Duke of Saxe-Merseburg-Zörbig (Merseburg, 15 February 1655 – Zörbig, 27 March 1715), was a German prince and member of the House of Wettin.
He was the third but second surviving son of Christian I, Duke of Saxe-Merseburg and Christiana of Schleswig-Holstein-Sonderburg-Glücksburg.
Christiana of Schleswig-Holstein-Sonderburg-Glücksburg
Princess Christiana of Schleswig- Holstein- Sonderburg- Glücksburg, often referred to as" Christiane"( 22 September 1634 in Copenhagen – 20 May 1701 at Delitzsch Castle) was the consort of Christian I, Duke of Saxe- Merseburg, who was the ruling Duke of Saxe- Merseburg from 1650 until his death.
Christian III Maurice, Duke of Saxe-Merseburg
Christian III Maurice, Duke of Saxe-Merseburg (Merseburg, 7 November 1680 – Merseburg, 14 November 1694), was a duke of Saxe-Merseburg and member of the House of Wettin.
He was the eldest son of Christian II, Duke of Saxe-Merseburg, and Erdmuthe Dorothea of Saxe-Zeitz.
Heinrich, Duke of Saxe-Merseburg
Heinrich, Duke of Saxe-Merseburg (Merseburg, 2 September 1661 – Doberlug, 28 July 1738), was a duke of Saxe-Merseburg and member of the House of Wettin.
He was the sixth (but fourth surviving) son of Christian I, Duke of Saxe-Merseburg and Christiana of Schleswig-Holstein-Sonderburg-Glücksburg.

Question: Who is the paternal grandfather of Christian Iii Maurice, Duke Of Saxe-Merseburg?
Answer: Christian I, Duke of Saxe-Merseburg