Dominique, comte de Cassini
Jean-Dominique, comte de Cassini (30 June 174818 October 1845) was a French astronomer, son of César-François Cassini de Thury.
Cassini was born at the Paris Observatory.
In 1784 he succeeded his father as director of the observatory; but his plans for its restoration and re-equipment were wrecked in 1793 by the animosity of the National Assembly.
His position having become intolerable, he resigned on 6 September and was thrown into prison in 1794, but released after seven months.
He then withdrew to Thury, where he died in 1845.
He published in 1770 an account of a voyage to America in 1768, undertaken as the commissary of the French Academy of Sciences with a view to testing Pierre Le Roy
’s watches at sea.
In 1783 he sent a memoir to the Royal Society in which he proposed a trigonometric survey connecting the observatories of Paris and Greenwich for the purpose of better determining the latitude and longitude of the latter.
His proposal was accepted, resulting in the Anglo-French Survey (1784–1790).
The results of the survey were published in 1791.
He visited England for the purposes of the work with Pierre Méchain and Adrien-Marie Legendre, and the three met William Herschel at Slough.
He completed his father's map of France, which was published by the Academy of Sciences in 1793.
It served as the basis for the "Atlas National" (1791), showing France in departments.
He was elected a Foreign Honorary Member of the American Academy of Arts and Sciences in 1788.
Cassini's "Mémoires pour servir
à l’histoire de l’observatoire de Paris" (1810) embodied portions of an extensive work, the prospectus of which he had submitted to the Academy of Sciences in 1774.
The volume included his "Eloges" of several academicians, and the biography of his great-grandfather, Giovanni Cassini.
His youngest son Henri was a botanist of some note.
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.
Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Fujiwara no Nagara
, also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.
He was the grandfather of Emperor Yōzei.
Prithvipati Shah
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Henri Cassini
Count Alexandre Henri Gabriel de Cassini (May 9, 1781 – April 23, 1832) was a French botanist and naturalist, who specialised in the sunflower family (Asteraceae) (then known as family Compositae).
He was the youngest of five children of Jacques Dominique, Comte de Cassini, famous for completing the map of France, who had succeeded his father as the director of the Paris Observatory.
He was also the great-great-grandson of famous Italian-French astronomer, Giovanni Domenico Cassini, discoverer of Jupiter's Great Red Spot and the Cassini division in Saturn's rings.
The genus "Cassinia" was named in his honour by the botanist Robert Brown.
He named many flowering plants and new genera in the sunflower family (Asteraceae), many of them from North America.
He published 65 papers and 11 reviews in the "[Nouveau] Bulletin des Sciences" of the Société Philomatique de Paris between 1812 and 1821.
In 1825, Cassini placed the North American taxa of "Prenanthes" (family Asteraceae, tribe Lactuceae) in a new genus "Nabalus".
In 1828 he named "Dugaldia hoopesii" for the Scottish naturalist Dugald Stewart (1753-1828).
Some genera (originally) named by him :

Question: Who is the paternal grandfather of Henri Cassini?
Answer: César-François Cassini de Thury