The only characters of the rookie 9 who has siblings are Kiba & Hinata.

Kiba has an older sister, Hinata has a younger. Hinata's sister owns her even though she's half her age. Hinata is a loser. Hinata should die.

That's it.

Edit: Oh and of course Sasuke has Itachi too, but that's basic.

Edit Edit: OMFG MY SIG FINALLY WORKS