 This means that Rita may not actually be Drama's biological mother, but either his stepmother and/or adoptive mother, with Vince and Johnny having the same biological father, who was an alcoholic and left the family when both were relatively young.Rita Chase may indeed be Johnny's biological mother.His line in "Aquamom", along with the fact that "Aquamom" came "after" "My Maserati Does 185" may support this theory.