Actually, nobody got them all exactly right (including first names), but BrunetteKoala was the closest, so he/she wins the 75 points!
From left to right:
My dad, Rick, with the apron and chef's hat.
Me, with just my head sticking out, wearing the glasses (just left of the cow-people).
Tricia's dad, Don, up top wearing the pirate patch.
My mom, Gail, at the bottom middle dressed as a snow queen.
My sisters, Rachel and Sarah, dressed as a bee and butterfly, respectively, just right of The Incredibles.
My uncle, Andy, wearing the blond wig, upside down on the bottom.
My brother-in-law, Ramon, dressed as Super Mario.