Väinö Malmivaara
Väinö Rafael Malmivaara (7 November 1879 – 13 November 1958) was the Lutheran Bishop of Oulu from 1943 to 1954.
He was a member of the Parliament of Finland from 1927 to 1933, representing the National Coalition Party.
He was born in Kiuruvesi, the son of Wilhelmi Malmivaara, and died in the same city.
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.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Tatu Malmivaara
Arvi Taneli (Tatu) Malmivaara (29 April 1908 - 8 February 1987) was a Finnish Lutheran clergyman and politician.
He was a member of the Parliament of Finland from 1945 to 1948, representing the National Coalition Party.
He was born in Lapua, the son of Väinö Malmivaara.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.

Question: Who is Tatu Malmivaara's paternal grandfather?
Answer: Wilhelmi Malmivaara