I am extremely close with my aunt who will have a significant role to play in my wedding. However, she co-habitates with a man who gives me the willies. They were married in the past, are now divorced, but still live together as a couple. The 'uncle' is not a father to any of my cousins.
I find him unnervingly creepy. He doesn't really speak to me (maybe 5 words in the last 10 years), I woke to find him staring at me in the guestroom one night as I stayed over at my aunt's house, and there are many hushed stories of similar incidents with other (female) members of the family.
I know it is incredibly poor etiquette to invite a family member and not their spouse, but I just don't want to see his face on my wedding day! Can I rationalize not inviting him?