<human>: Can you provide a brief overview of the text?

On mobile, this may be long and not very pretty

This May I will be marrying my best friend. I am way beyond excited for this. It will be a small and intimate wedding that I and my soon-to-be husband will be paying for 100% out of our own pockets. We have each invited out closest friends and family. 

My mom and dad were never married, but they did spend ~10 years together until they split up when I was 8yrs old. Since then they have never had a positive relationship with each other. For the last ~12yrs  they have trash talked each other a lot. Including to my face. They've both given conflicting stories as to why they split, but, honestly I don't care. They are my mom and dad and are equally important to and loved by me.

The issue is that after inviting them both and asking them to be cordial to each other for the sake of my wedding day they've each made comments that lead me to believe they won't be very civil toward one another. Upon letting my mom know that my father will be in attendance her comments were "Oh, will his hefer of a wife be there?" And "Daddy FINALLY made time to be there for his daughter?" (After they split my father became very successful in his career and made a substantial amount of money, but wasn't exactly present for my teen years because of his job) my fathers only comment went something along the lines of "That c*** better stay away from me". I understand that they no longer love each other but all I really want is for them to put their differences aside for a single afternoon to celebrate me and my marriage. I don't expect them to be buddy-buddy or to even hang out. I just want this day to be in celebration of me and my husband without some Jerry Springer brawl. What can I say/do to make sure my wedding day goes as smoothly as possible? Un-inviting either parent is not an option.
<bot>: Mom and Dad really hate each other. Both are invited to my wedding. How can I help them accept each others presence if only for my wedding day?