“I’m 28. I will marry a wonderful woman in August. My mother brainwashed me with venom about my father for 24 years. He lives nearby. I hardly know him. I think I want him at my wedding. She is threatening to boycott if he is invited or there.”
It’s your wedding. Except for your mother’s friends whom you want included, the invitation list (under these toxic conditions) is none of her business. Allow your mother hostage power now means you can expect her to try to wield similar threatening power over other matters in your married life.
The good news is you have several months to complete important work with both parents.
Contact dad. Invite him into the slow, deliberate process of deeper, appropriate, father-son intimacy. (Use your own words). Suggest a bi-weekly breakfast and tell him there will be no talk whatsoever about your mother. After a few breakfasts include the “wonderful woman.”
Stand up to your mother. Tell her you want her at the wedding but it is an invitation she may always decline. Include her on other plans – the challenge is to not alienate your mother but to clearly define your response to her controlling ways.
Defining yourself to both your parents will do more for your long-term fulfillment than anything else you do.