Margo Howard
Margo Howard (née Lederer; born March 15, 1940) is an American writer and former advice columnist.
She is the only child of businessman/innovator Jules Lederer and Eppie Lederer (better known as Ann Landers after her long-time advice column "
Ask Ann Landers"), the niece of Pauline Phillips, and the cousin of Jeanne Phillips (the latter two both better known as Abigail Van Buren and authors of the advice column "Dear Abby").
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Adam Coleman
Adam Coleman( born 7 October 1991) is an Australian rugby union player living in Melbourne who plays lock for the Melbourne Rebels in Super Rugby.
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.
Lindsay C. Howard
Lindsay Coleman Howard( March 31, 1904 – September 6, 1971) was an American sportsman.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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
Adam Coleman Howard
Adam Coleman Howard is an American actor, screenwriter and film director.
He is the son of advice columnist Margo Howard, the grandson of advice columnist Ann Landers and the stepson of actor Ken Howard.

Question: Who is the maternal grandfather of Adam Coleman Howard?
Answer: Jules Lederer