At least one (his brother Naroop Jhooti,) who is two years younger than him. I've also heard he has a younger sister named Nishma Jhooti but I've never seen that confirmed by him anywhere.
jay Sean only has one brother, his name is naroop.
Yes he has two brothers one whom is gay and one whom is adopted.
Jay Sean is 29 at the moment and will be 30 this year on the 26th March love him hes the best!