So you think you're so clever never in doubt
   But I've seen you two together fooling about
   Don't get me wrong now I've seen what you are
   Mummy wouldn't like it - its gone too far
  
   Got to - keep it in the family
   Learn to - keep it in the family
   Have to - keep it in the family
   Want to - keep it in the family
  
   Playing with each other its your favourite game
   You never try to hide it there's no shame
   You'll soon be discovered what will you do then
   Family entertainment will come to an end
  
   Got to ...