Vunipola Sr moved to Wales in 1998 to join Pontypool RFC and his two sons were brought up in the UK and went on to win representative honours under Stuart Lancaster .
His two sons now play for Saracens .
Vunipola Sr moved to Wales in 1998 to join Pontypool RFC and his two sons , who now play for Saracens , were brought up in the UK and went on to win representative honours under Stuart Lancaster .