Lady Macduff's background

Lady Macbeth may feel neglected. Macduff is in the beginning of the play quite a bit, which means he isn't at home with Lady Macduff and her son. She may feel that if Macduff is going to leave again, he can just stay away and never come back. She feels that he has abandoned his family for the last time! She wants to know how her son would feel about having a step-father.