AphroditeAngel77 wrote:
Jon Voight & Angelina Jolie
Jennifer Aniston & John Aniston
Charlie Sheen & Emilio Estevez
Sean Astin, Mackenzie Astin and Patty Duke
Yeah, I remember being shock for this as well.  I used to watch DAYS all the time and then when Friends started, it was a few months before I even knew that Jennifer was John's daughter. 

Warren Beatty and Shirley is another.  They look nothing alike and I couldn't believe they were brother/sister.