Hi all - I've got a question about wording on announcements/invitations. We have sort of complicated families, and I can't find anything that fits this very well! Any thoughts you have are greatly appreciated

My mom will be paying for the majority of the wedding, with my fiancé's mom chipping in the traditional amounts (flowers, rehearsal dinner, etc.). It's very important to my mom to have her name on the invitation - as in, "[Mom] requests the honor of your presence..." She is recently widowed, though, as my dad passed away not too long ago, so we're unsure whether to put his name on there as well.
My fiancé's parents are divorced, and both have re-married. His mother has a same-sex partner, and his father has another wife. His mom's partner has been a HUGE part of his life, so we can't just leave her off and put his parents' names on there alone. I suspect it should look like any other divorced/re-married family, but my conundrum is that I can't find much in the way of etiquette/suggestions that deal with the groom's parents being re-married - only the bride's.
Thoughts on either/both of these situations? Thanks
