Do all the classic sitcoms from the 50s and 60s pay residuals? Would the estates of I love Lucy and Ozzie and Harriet, and the stars from say Green Acres, Bewitched, and all the other shows still get residuals if their shows is being broadcast presently on a television channel or turned into DVDs. How do residuals work?

I believe all the old shows except I love lucy do not see any residuals from their shows.

Who knows with those old shows. I doubt it, though.

http://www.sagaftra.org/content/residuals-faq

That's how they work for the Screen Actors Guild, it's pretty fascinating.