Margaret of Brunswick-Lüneburg (1442–1512)
Margaret of Brunswick- Lüneburg( 1442 – 8 April 1512 in Wienhausen) was a princess of Brunswick- Lüneburg by birth and by marriage a Duchess of Mecklenburg- Stargard.
Dorothea of Brunswick-Lüneburg
Dorothea of Brunswick-Lüneburg (1 January 1570 – 15 August 1649) was a daughter of Duke William "the younger" of Brunswick-Lüneburg and his wife, Dorothea of Denmark, Duchess of Brunswick-Lüneburg.
She married Count Palatine Charles I of Zweibrücken-Birkenfeld.
They had four children:
Matilda of Brunswick-Lüneburg
Matilda of Brunswick- Lüneburg( 1276 – 26 April 1318) was a German noblewoman and member of the House of Welf.
By birth, she was a duchess of Brunswick- Lüneburg and by marriage Duchess of Glogów, Ścinawa, etc.
She was the seventh child and only daughter of Albert I, Duke of Brunswick- Lüneburg by his second wife Alessina, daughter of Margrave Boniface II of Montferrat.
Francis Otto, Duke of Brunswick-Lüneburg
Francis Otto, Duke of Brunswick- Lüneburg( 1530 – 1559) was the Prince of Lüneburg from 1555 to 1559.
He was the son of Ernest I, Duke of Brunswick- Lüneburg.
William the Younger, Duke of Brunswick-Lüneburg
William VI (4 July 1535 – 20 August 1592), called William the Younger , was Duke of Brunswick-Lüneburg and Prince of Lüneburg from 1559 until his death.
Until 1569 he ruled together with his brother, Henry of Dannenberg.
William was the son of Ernest I, Duke of Brunswick-Lüneburg.
On 12 October 1561 he married Dorothea of Denmark (29 June 1546 Kolding–6 January 1617 Winsen), daughter of Christian III of Denmark and Dorothea of Saxe-Lauenburg.
In 1582, William began suffering from fits of insanity.
These fits caused his wife to flee him in 1584 for her own safety.
After William's death, his wife became regent for their son George.
Margaret of Brunswick-Lüneburg
Margaret of Brunswick-Lüneburg (6 April 1573 - 7 August 1643), was a German noblewoman member of the House of Welf and by marriage Duchess of Saxe-Coburg.
Born in Celle, she was the ninth of fifteen children born from the marriage of William the Younger, Duke of Brunswick-Lüneburg and Dorothea, Princess of Denmark.
Elizabeth of Denmark, Duchess of Brunswick-Wolfenbüttel
Elisabeth of Denmark (25 August 1573 – 19 July 1625) was duchess consort of Brunswick-Lüneburg as married to Duke Henry Julius of Brunswick-Lüneburg.
She was regent of Brunswick-Lüneburg in 1616-1622.
Henry the Peaceful, Duke of Brunswick-Lüneburg
Henry the Peaceful( 1411 – 7 December 1473), Duke of Brunswick- Lüneburg, called the Peaceful, ruled over both parts of Brunswick- Lüneburg.
Catherine of Brunswick-Lüneburg
Catherine of Brunswick- Lüneburg( 1395 – 28 December 1442, Grimma) was a member of the House of Welf, a princess of Brunswick- Lüneburg and by marriage, the Electress of Saxony.
Anna of Brunswick-Lüneburg (1502–1568)
Anna of Brunswick- Lüneburg( 6 December 1502 in Celle – 6 November 1568 in Szczecin) was a princess of Brunswick- Lüneburg by births and marriage Duchess of Pomerania.

Question: Who is the paternal grandfather of Margaret Of Brunswick-Lüneburg?