I've owned:
1987 Oldsmobile Cutlass Cierra (eh technically my parents)
1995 Pontiac Grand Am GT
2000 Chevrolet Camaro Z/28
1999 Pontiac Grand Prix GT
Looking for something new...
98-02 Pontiac Trans Am or Firebird Formula ??
97-04 Corvette FRC or Z06 ??
1987 Grand National ??
My immediate family has owned:
Two S-10s (sister)
Chevrolet Caprice Stationwagon
1988 Chevrolet Silverado (Dad)
1999 Chevrolet Silverado (Dad)
Early 90s Cavalier (Mom)
2000 Chevrolet Malibu or 1999 (Mom)
1999 Monte Carlo (Sister)
2003 Grand Prix (Sister) She had a monte carlo too
1990s Bonneville (Sister)
2004 Bonneville (Sister)
2000 Bonneville (Mom)
2002 Gran Am GT (Sister)
1980s Chevy Pick up (Sister)
2004 Silverado (Sister)
2008 G8 GT (GF)
All I can remember right now, I'm sure there are more, but I was bored. If I start mentioning cousins and unlces and sh*t, it'd get more ridiculous. I wish I could take a picture a family renunions, you'd all be very impressed. I'll take one, one day, and send it to GM.
Another thing, my parents owned a lot more GM before I was born like, 50-60s Chevy's, Bel-Airs, GTO, but I can't remember that stuff.