The mention of a specific date in a dream is odd, unless it pertains specifically to something important,....anniversary, birthday etc. In this instance, it's the day before Mother's Day.

The Devil in dreams usually represents urges, and emotions that are repressed, or ones you feel you cannot control. That it was your Mother suggests that you feel she, or another female authority figure, is showing emotions beyond your control.
Being forced to sign a contract, suggests you feel that your mother or, a woman of authority, is trying to take advantage of your husband.

Has the subject of a Mother's Day gift or celebration come into conversation recently?
Have you been thinking about an expensive gift for your mother, and your husband said no to the expense, or feel that she wouldn't appreciate it?
Does your Mother and Husband 'get along' well together...or does your Mother feel that your husband isn't good enough for you?

Hope this helps give you some insight. Good Luck!

Sorry to hear you're having trouble with your Mom, but...I'm Glad I could help.

Best wishes!