*Spoilers for all of Firestar’s kin!!!!!*
So here it goes!
Here is his family tree from Warrior Wiki
Mate:Sandstorm: Deceased, verified StarClan member
Father:Jake: Deceased, residence unknown
Mother:Nutmeg: Living (As of Fire and Ice)
Sister:Princess: Living (As of Dawn)
Half-sister:Ruby: Living (As of The Rise of Scourge)
Ooooooohhhhhh look what I found!