My fiance and I want a small intimate wedding with just our closest family and friends (about 60 people). To cut costs we are leaving out a lot of people who we love dearly but maybe have just kept out of touch with over the past couple of years. That being said, my parents are divorced and I absolutely cannot stand my father's wife. I'm pretty sure the term 'evil stepmother' was created after her. She is less than pleasant to be around. Anyway, said stepmother has made it a point to tell my father that her parents need to be invited. I have zero relationship with these people and the last time I saw them her mother tried to get in to an altercation with me. How to I gently tell my father that there is no chance I will include them on our special day? What is the etiquette with that?