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From Answers:  Justin Bieber's Siblings He has one little sister (a stepsister) who is 14 years younger than Justin, and her name is Jazmyn, and a little bro (a stepbrother) who is 15 years younger than Justin named Jaxon. Yep, they all have J names. Correction- All 3 share the same Father, while Justin has a different Mother than Jazmyn and Jaxon. Therefore, they are Justin's half-siblings, not step-siblings.Justin Bieber has one half sister named Jazmyn Bieber and one half brother named Jaxon Bieber.justin bieber has one step-brother and one step-sister his sister is called Jazmyn Kathleen Bieber and his brother is called Jaxon Julian Bieber. jazmyn born on may 30 2008 and jaxon born on november 20 2009.