There's no relation between Susan Olsen and the Olsen twins.
* Susan Olsen is an American actress best known for playing the role of "Cindy" in the popular television series "The Brady Bunch" (1969-1974).
* The Olsen Twins, Mary-Kate and Ashley Olsen, are actresses who rose to fame as babies playing the character of "Michelle Tanner" in the ABC sitcom "Full House" (1987-1995).
They are from different families and rose to fame in different eras of television history.