Cousins who competed in season 23
Mother and son who competed in seasons 14 and 18
Friends who competed in seasons 15 and 18
Brothers who competed in seasons 16 and 18
Engaged couple who competed in season 22
Best friends who competed in season 22
Twins who competed in season 21
Friends who competed in season 20
Newlyweds who competed in season 20
Friend who competed in season 22
Father and son cancer survivors who competed in season 22
PHOTOS: Meet Survivor Season 28's Castaways!