Justin Bieber doesn't have a girl friend but if you are referring to his ex Caitlin Beadles then her little brother is Christan Beadles he appears in Justin's music video for eenie meenie ft Sean Kingston
I'm assuming you're thinking of the rumour of JB and Catlin Beadles? If so, her brother is Christian Beadles :D
Marie.
Carin
Jax-on
His three girlfriends are Taylor swift,Selena Gomez and Katy Perry.
Justin Biebers ex girlfriends name is Caitlin PS. i <3 Justin Bieber so much you don't even know!!!!!!!!!!
Jaxon Bieber
Justin Biebers Little Brothers name is Jaxon
Selena Gomez Catlin Beadles is his X Tiara Barksdale
His brothers name is reaver beaver beiber.
Justin bieber doesn.t have any 12 yr old brothers
Her name was Caitlin Beadles, and i am not sure how long they went out, but they are still very close friends
one its Justin bieber and 2 his brothers name is jaxon bieber his dads child and his dad has another she a girl jazmyn