Wow, astorian, you summed it up like crazy. Great thread BNB.
Talia Shire has proven herself. It’s not hard to become lost in the scenery up there with Pacino, Brando, Duvall, Caan, Keaton et al, but she was fabulous as Connie in The GF. And GF II. She was also terrific as Adrian in the first Rocky movie (the good one).
Nick Cage? Awesome talent. From Raising Arizona (as mentioned above) to a dizzyingly great turn in Leaving Las Vegas. He’s his own star.
NOBODY MENTIONS Sofia Coppola? When Wynona Ryder got sick (mono, I believe), Francis swapped in his doe-eyed daughter in GF III. The sucking sound coming from the screen was audible, even with the volume turned down. Opposite Andy Garcia (who is quite good IMHO), she looked like a scared runaway in juvie hall. Just bloody awful.
RE: Sheen/Sheen/Estevez: Martin is terrific, Charlie is fun in a spoof or a buddy action flick, Emilio is Repo Man. None is Olivier. All 3 can carry a movie with their name above the title, and have done so many times.
I agree with the Bridges brothers mentioned above, and will throw in Warren Beatty and his sister Shirley MacLaine (many folks don’t know they’re sibs, though). Both can (could) carry a film on name alone.
Ryan O’Neal’s little girl got a purty gold statue of her own. Tatum earned it, great film (Paper Moon).
Sean Penn may be (arguably) the best actor of this generation, and his brother Chris was astonishingly good in Reservoir Dogs and several other films. Their brother Michael can write a pretty darn good pop song, too. PS: Sean is a lousy director. Cite: The Crossing Guard.
RE: Jaid Barrymore… I think Drew got her fame from Lionel and John, and now Jaid’s trading on 3rd hand fame from Drew. I don’t WHAT the hell she is, except Jackie Stallone with a little less class and poise. Ouch.
Baldwins: A likeable bunch, overall. See Alec in Glengarry Glen Ross, and you’ll know why he’s a star. The others are mostly for looks (except Stephen (?) in The Usual Suspects).
Quaids: Can act
Carradines: Can act
Roberts: Can act, but Julia’s choosing some truly lightweight stuff now and Eric sort of fell into his own pit during the coke-fueled 80’s. Both have the talent, looks and ability to do it right.
Keachs: Can act
Raitts: Bonnie certainly didn’t ride John’s coattails to fame.
Gibbs: Nobody can say ANY of them can’t sing - well, Andy can’t NOW. IIRC, Barry wrote all of Andy’s hits.
Mary Martin and her son Larry Hagman - both accomplished and successful without charges of nepotism.
Master P’s little son Lil’ Bow Wow is certainly burning up the charts. I doubt he produced the thing himself 
Anjelica Huston has done pretty well, her dad was director John Huston.
My point? I have no idea, except to say that the sword swings both ways.