Hedwig Pringsheim
Hedwig Pringsheim (born Gertrud Hedwig Anna Dohm; 13 July 1855 – 27 July 1942) was a German actress.
Born in Berlin, she was the daughter of Ernst Dohm and Hedwig Dohm-Schleh, who were Jewish converts to Christianity.
She married Alfred Pringsheim.
They had 5 children: Erich Pringsheim, Peter Pringsheim, Heinz Pringsheim, Klaus Pringsheim Sr.
and Katia Pringsheim who married Thomas Mann.
Pringsheim died in Zurich.
Katia Mann
Katia Mann (born Katharina Hedwig Pringsheim; July 24, 1883 – April 25, 1980) was the youngest child and only daughter (among four sons) of the German Jewish mathematician and artist Alfred Pringsheim and his wife Hedwig Pringsheim, who was an actress in Berlin before her marriage.
Katia was also a granddaughter of the writer and women's rights activist Hedwig Dohm.
Her twin brother Klaus Pringsheim was a conductor, composer, music writer and music pedagogue, active in Germany and Japan.
She married the writer Thomas Mann.
Zhao Shoushan
Zhao Shoushan( 12 November 1894 – 20 June 1965) was a KMT general and later Chinese Communist Party politician.
He is the grandfather of Zhao Leji.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
John Mackay (poet)
John Mackay( 1656–1754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.

Question: Who is the maternal grandfather of Katia Mann?
Answer: Ernst Dohm