Vadim Vlasov
Vadim Nikolayevich Vlasov( born 19 December 1980) is a former Russian football player.
He is a younger brother of Dmitri Vlasov.
Miloš Zličić
Miloš Zličić( born 29 December 1999) is a Serbian football forward.
He is a younger brother of Lazar Zličić.
Guglielmo Marsili
Guglielmo Marsili( born 2 February 1946) is an Italian water polo player.
He competed in the men's tournament at the 1972 Summer Olympics.
Markus Weissenberger
Markus Weissenberger( born March 8, 1975) is an Austrian former footballer who played as a midfielder.
He is a younger brother of former Austria international player Thomas Weissenberger.
Ghilino Ghilini
Ghilino Ghilini or Guglielmo de Guillini or Ghilino Ghillini( died 1559) was a Roman Catholic prelate who served as Bishop of Comacchio( 1514 – 1559).
Antonio Crispo, Governor of the Duchy of the Archipelago (died 1584)
Antonio Crispo( died 1584) was a governor of the Duchy of the Archipelago between 1544 and 1554.
He was the son of William Crispo( or" Guglielmo";- 1555) and his unknown wife, and paternal grandson of Antonio Crispo.
He married a lady of the noble Greek Gavalas family from Rhodes, without issue.
Roman Smishko
Roman Smishko is a retired Ukrainian professional footballer who played as a goalkeeper.
He is a younger brother of Ukrainian defender Bohdan Smishko.
Manuel Orantes
Manuel Orantes Corral( born 6 February 1949) is a former tennis player from Spain who was active in the 1970s and 1980s.
He won the US Open men's singles in 1975, beating defending champion Jimmy Connors in the final.
Orantes reached a career- high singles ranking of World No. 2.
Dmitri Varfolomeyev (footballer, born 1978)
Dmitri Nikolayevich Varfolomeyev( born 15 March 1978 in Leningrad) is a former Russian football player.
He is a younger brother of Sergei Varfolomeyev.
Anton Shunto
Anton Shunto( born 31 May 1988) is a Belarusian professional footballer.
As of 2019, he plays for Molodechno.
He is a younger brother of Denis Shunto, who is a founder and former president of Krumkachy Minsk.

Question: Who is younger, Manuel Orantes or Guglielmo Marsili?