Johann Georg, Duke of Saxe-Weissenfels
Johann Georg, Duke of Saxe- Weissenfels( 13 July 1677, in Halle – 16 March 1712, in Weissenfels), was a duke of Saxe- Weissenfels- Querfurt and a member of the House of Wettin.
He was the third child and first surviving son of Johann Adolf I, Duke of Saxe- Weissenfels, by his first wife, Johanna Magdalena of Saxe- Altenburg.
Magdalena Sibylla of Saxe-Weissenfels (1673–1726)
Magdalene Sibylle of Saxe- Weissenfels
( 3 September 1673 – 28 November 1726), was a German noblewoman member of the House of Wettin( Albertine line) and by marriage Duchess of Saxe- Eisenach.
Born in Halle, she was the oldest daughter and first child of Duke Johann Adolf I of Saxe- Weissenfels and his wife Johanna Magdalena, the daughter of Duke Frederick William II of Saxe- Altenburg.
She was named after her paternal great- grandmother, Duchess Magdalene Sibylle of Prussia.
Magdalena Sibylla of Saxe-Weissenfels
Magdalena Sibylle of Saxe-Weissenfels (2 September 1648 – 7 January 1681) was a German noblewoman.
She was a daughter of August, duke of Saxe-Weissenfels, and his wife Anna Maria of Mecklenburg-Schwerin.
Her paternal grandparents were John George I, Elector of Saxony, and Magdalene Sibylle of Prussia.
On 14 November 1669, she married Duke Friedrich I of Saxe-Gotha-Altenburg.
They had the following children:
Johann Adolf II, Duke of Saxe-Weissenfels
Johann Adolf II, Duke of Saxe- Weissenfels
( Weissenfels, 4 September 1685 – Leipzig, 16 May 1746), was the last duke of Saxe- Weissenfels- Querfurt and a member of the House of Wettin.
He was also a commander in the Saxon army.
Johann Adolf was the youngest of the eleven children of Johann Adolf I, Duke of Saxe- Weissenfels, and Johanna Magdalena of Saxe- Altenburg.
His mother died five months after his birth, on 22 January 1686.
Frederick, Duke of Saxe-Weissenfels-Dahme
Frederick of Saxe- Weissenfels(" Frederick Erdmann"; b. Halle, 20 November
1673- d. Dahme, 16 April 1715), was a German prince member of the House of Wettin and Duke of Saxe- Weissenfels- Dahme.
He was the sixth son of Augustus, Duke of Saxe- Weissenfels but first- born from his second marriage with Johanna Walpurgis of Leiningen- Westerburg.
Augustus, Duke of Saxe-Weissenfels
Augustus of Saxe- Weissenfels( Dresden, 13 August 1614 – 4 June 1680, Halle), was a Duke of Saxe- Weissenfels- Querfurt of the House of Wettin and administrator of the Archbishopric of Magdeburg.
He was the fourth( but second surviving) son of John George I, Elector of Saxony, and his second wife, Magdalene Sibylle of Prussia.
Christian, Duke of Saxe-Weissenfels
Christian, Duke of Saxe- Weissenfels( 23 February 1682 in Weissenfels – 28 June 1736 in Sangerhausen), was a duke of Saxe- Weissenfels- Querfurt and member of the House of Wettin.
He was the sixth( but second surviving) son of Johann Adolf I, Duke of Saxe- Weissenfels, and Johanna Magdalena of Saxe- Altenburg.
Johann Adolf I, Duke of Saxe-Weissenfels
Johann Adolf I, Duke of Saxe- Weissenfels( 2 November 1649, in Halle – 24 May 1697, in Weissenfels), was a duke of Saxe- Weissenfels- Querfurt and member of the House of Wettin.
He was the first son of Augustus, Duke of Saxe- Weissenfels, and his first wife, Anna Maria of Mecklenburg- Schwerin.
Albrecht of Saxe-Weissenfels
Albrecht of Saxe- Weissenfels( 14 April 1659 in Halle – 9 May 1692 in Leipzig), was a German prince of the House of Wettin.
He was the fifth and youngest son of August, Duke of Saxe- Weissenfels, and his first wife, Anna Maria of Mecklenburg- Schwerin.
Anna Maria of Mecklenburg-Schwerin
Anna Maria of Mecklenburg-Schwerin (1 July 1627, in Schwerin – 11 December 1669, in Halle) was a German noblewoman, a member of the House of Mecklenburg and by marriage Duchess of Saxe-Weissenfels.
She was the fourth child and second daughter of Adolf Frederick I, Duke of Mecklenburg-Schwerin by his first wife Anna Maria, daughter of Enno III, Count of Ostfriesland.
In older historiography she appears with a third name, "Dorothea", but modern historians have discarded it.

Question: What is the date of death of Magdalena Sibylla Of Saxe-Weissenfels's mother?
Answer: 11 December 1669