Well in act 1 scene 7, lady Macbeth convicts Macbeth to kill King Duncan and Macbeth finally agrees. But the relationship between the two characters is that Macbeth is willing to do something that is dreadful so he and Lady Macbeth can become king and queen. (I'm not sure if this actually answer the question, but I gave it a try. I really do hope this helps. Sorry if it doesn't answer the question, it's been awhile since I have done this topic.)