Question: Who is the paternal grandfather of Randolph Greene Pack?

Context paragraphs:
title: Prithvipati Shah
paragraph_text: Prithvipati Shah( ?–1716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal. He was the grandfather of Nara Bhupal Shah.
title: Randolph Greene Pack
paragraph_text: Randolph Greene Pack (1890 in Cleveland, Ohio – December 25, 1956 in Greenwich, Connecticut), son of Charles Lathrop Pack, grew up in Cleveland, Ohio, at the turn of the century. He attended the college preparatory Ransom School, followed by stints at Williams College (class of 1913) and Penn State, the latter in a forestry program.
title: George Pack Jr.
paragraph_text: George Pack Jr.( 1794 in Saint John, New Brunswick, Canada – April 15, 1875 in Pack's Mills, Michigan) was a businessman, landowner, sawmill operator, and postmaster on the Lower Peninsula of Michigan. The town of Pack's Mills of which he was also postmaster, was named after him. Pack's son, George Willis Pack; grandson, Charles Lathrop Pack; and great- grandson, Randolph Greene Pack were to follow him in the timber business in Michigan, New York and beyond.
title: Charles Lathrop Pack
paragraph_text: Charles Lathrop Pack (May 7, 1857 – June 14, 1937), a third-generation timberman, was "one of the five wealthiest men in America prior to World War I". He owed his good start in life to the success of his father, George Willis Pack, and grandfather, George Pack, Jr. in the forestry sector. Growing up on Lake Huron in Michigan's Lower Peninsula, Charles L. Pack lived in Cleveland, Ohio, from 1871 to the early years of the 20th century. With "savvy investments ... in southern timber ... banking and real estate", Pack became a multi-millionaire. During World War I, he was a principal organizer and was heavily involved in the war garden movement in the United States.
title: Guillaume Wittouck
paragraph_text: Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate. He was the Grandfather of industrialist Paul Wittouck.
title: John Westley
paragraph_text: Rev. John Westley( 1636 – 78) was an English nonconformist minister. He was the grandfather of John Wesley( founder of Methodism).
title: Abd al-Muttalib
paragraph_text: Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
title: Lyon Cohen
paragraph_text: Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist. He was the grandfather of singer/ poet Leonard Cohen.
title: Kaya Alp
paragraph_text: 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.
title: George Willis Pack
paragraph_text: George Willis Pack( born 1831, Peterboro, New York; d. August 31, 1906, Southampton, Long Island, New York) was a second- generation timberman on Michigan's Lower Peninsula. Building on his father's legacy, over the course of several decades, Pack successfully developed his timber businesses, becoming one of Michigan's first millionaires. His son, Charles Lathrop Pack; and grandson, Randolph Greene Pack, carried on the family tradition.

Reasoning steps:
Randolph Greene Pack father Charles Lathrop Pack
Charles Lathrop Pack father George Willis Pack

Answer: spans: George Willis Pack