A little background, my fiance's parents have been divorced for about 10+ years (many years before we met). Despite being divorced for over a decade, there is still a lot of animosity, and there's always tension when FFIL brings his GF (former mistress), to family events. Out of all of his siblings, my FI is the only one that seems to get a long with his father, and although FI doesn't like his dad's girlfriend, she will be invited to our wedding next year.
Here is my question, does FFIL's GF get mentioned in the wedding program? Do we give her a corsage like we're giving to the MOB and MOG? My FI is worried that recognizing the GF in our program and giving her a corsage will hurt his mom's feelings. I have an amazing relationship with my FMIL, and I don't want to hurt her feelings. I have no relationship with the GF, but I don't want to hurt her feelings either. What does etiquette dictate?