Vurrukt is Vegeta's second brother (his first brothers name was Tarble i'll put a link of the episode where it shows him) but Vegeta never really knew him for Vurrukt was always going to different planets as he pleased and fought the toughest opponents he could find.
Until he went on a trip to an unkown planet and never returned….
(takes place about 15 minutes after he crash land on Equestria)