Waldemar VI, Prince of Anhalt-Köthen
Waldemar VI, Prince of Anhalt-Köthen (1450 – Köthen, 1 November 1508), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Köthen.
He was the eldest son of George I, Prince of Anhalt-Dessau, by his second wife Sophie, possibly a member of the House of Hohnstein.
Augustus Christian Frederick, Duke of Anhalt-Köthen
Augustus Christian Frederick of Anhalt-Köthen (Köthen, 18 November 1769 – Schloss Geuz, 5 May 1812), was a German prince of the House of Ascania, ruler of the principality of Anhalt-Köthen, and from 1806 the first "Duke of Anhalt-Köthen."
He was the eldest son of Karl George Lebrecht, Prince of Anhalt-Köthen, by his wife Louise Charlotte, daughter of Frederick, Duke of Schleswig-Holstein-Sonderburg-Glücksburg.
Wolfgang, Prince of Anhalt-Köthen
Wolfgang, Prince of Anhalt- Köthen( 1 August 1492 in Köthen – 23 March 1566 in Zerbst), was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was one of the earliest Protestant rulers in the Holy Roman Empire.
He was the second( but eldest surviving) son of Waldemar VI, Prince of Anhalt- Köthen, by his wife Margarete, daughter of Günther XX, Count of Schwarzburg and Lord of Arnstedt.
George I, Prince of Anhalt-Dessau
George I, Prince of Anhalt-Dessau (– 21 September 1474), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Dessau.
He was the second son of Sigismund I, Prince of Anhalt-Dessau, by his wife Judith, daughter of Gebhard XI, Count of Querfurt.
Waldemar V, Prince of Anhalt-Köthen
Waldemar V, Prince of Anhalt- Köthen( died 1436) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was the second son of Albert IV, Prince of Anhalt- Köthen, by his first wife Elisabeth, daughter of Gebhard III, Count of Mansfeld.
Adolph I, Prince of Anhalt-Köthen
Adolph I, Prince of Anhalt- Köthen( died Zerbst, 28 August 1473), was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was the eldest son of Albert IV, Prince of Anhalt- Köthen, by his first wife Elisabeth, daughter of Gebhard III, Count of Mansfeld.
Albert VI, Prince of Anhalt-Köthen
Albert VI, Prince of Anhalt- Köthen( died 9 January 1475) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was the youngest son of Albert IV, Prince of Anhalt- Köthen, but the eldest child of his second wife Elisabeth, daughter of Gebhard XI, Count of Querfurt.
Magnus, Prince of Anhalt-Köthen
Magnus, Prince of Anhalt- Köthen( 1455 – 29 October 1524) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was the third( but eldest surviving) son of Adolph I, Prince of Anhalt- Köthen, by his wife Cordula, daughter of Albert III, Count of Lindau- Ruppin.
Emmanuel Lebrecht, Prince of Anhalt-Köthen
Emmanuel Lebrecht of Anhalt-Köthen (Köthen, 20 May 1671 – Köthen, 30 May 1704), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Köthen.
He was the only child of Emmanuel, Prince of Anhalt-Köthen, by his wife Anna Eleonore, daughter of Henry Ernest, Count of Stolberg.
Philip, Prince of Anhalt-Köthen
Philip, Prince of Anhalt-Köthen (31 May 1468 – 13 November 1500) was a German prince of the House of Ascania and ruler of the principality of Anhalt-Köthen.
He was the only son of Albert VI, Prince of Anhalt-Köthen, by his wife Elisabeth, daughter of Günther II, Count of Mansfeld.

Question: Who is Waldemar Vi, Prince Of Anhalt-Köthen's paternal grandfather?
Answer: Sigismund I, Prince of Anhalt-Dessau