Hi JB, first you want to just learn to lucid dream and stabilise your dream once you become aware in it. It may take time before you can remove things or add things but after a short while you should be able to do this. So basically yes you can remove them from your dream but before you do just stand up to thm and ask "what do you want" or "what do you represent" you ay then find that ths person who you don't like may actually be very nice to you, ths happens a lot so please try that first