His real name is Justin Bieber, pronounced bee-ber.
Justin Timberlake ALL THE WAY.
Um... I don't know if you're pathetically and idiotically trying to be funny or if you're serious... So, no. No, he did not.
When he was either almost 16 or already 16.
No he does not. He has 2 half siblings that are made public but as far as cousin's go, only close family and friends know.