King Lear- Deception

PLEASE PLEASE PLEASE help me with this! I am writing an in class essay on how betrayal and treachery in King Lear help develop characters and theme. My theme is injustice, and so far I have betrayal from goneril and Reagan towards King Lear, Betrayal between edmund and glouserter, and King Lear betraying the people that actually care about him. I know I have three bUt I am not happy with them, so please feel free to make suggestions

Any and all help would be really appreciated

Thanks