Well, my family is pretty big, but here are the ones I see as key...
Mum (registered as Mum on forums) & Murray (Stepdad)
Back row: John (Step-cousin-in-law xD), random friend of family, Marty (Brother-in-law), Josh (stepbrother, aka Loony JosH), Dad
Front row: Krystal (Step-cousin and ex-girlfriend... we started going out before my Dad married her aunt), Danielle (stepsister), Nikki (sister, aka Tweety_Ch1ck), Stephanie (half-sister), Anneke (stepmum)
In Nikki's arms: Kate (niece), Jaimee (niece, I personally call her JAG)
Since Josh has changed his look since that photo, here's a newer one.
And my favourite cuz to best-friend levels, Suzanne (aka ms_devli).
Absent from all recent photos of my family... me! Being at the other end of the world can have it's downsides. But I get along with all of them so yay for that.