Is success really a DNA thing? We have had a lot of sons/daughters of sports stars try to follow their parent's or siblings footsteps but were not as successful. On the flipside, we do have some truly Iconic sports families. I would list out some I know where different members of a family achieved moderate to huge success in sports.
Segun Odegbami and Wole Odegbami - football, Nigeria (brothers)
The Ayews - Abedi Pele, Kwame Ayew (brother of Abedi), André Ayew, Jordan Ayew
Kalu Uche and Ik Uche - football, Nigeria (brothers)
Davidson and Osmond Ezenwa (twin brothers, athletics)
Emma and Patrick Okala (brothers and Goalkeepers)
Kanu Nwankwo and Ogbonna Kanu
John and Peter Utaka
Finidi George and Late Igenewari George
Sunday Oliseh and Azubuike Oliseh
Serena and Venus Williams
Johan Cruyff and Jodi Cryuff
Inaki and Nico Williams - football, Inaki (Ghana), Nico (Spain)
Gary Neville and Phil Neville
Frank Lampard Sr and Frank Lampard Jr
You can name yours too.