I wonder if the OP refers to their spouse as stepbro/stepsis now (I totally would, jokingly, and in front of said parents)
Yep

Original post link: https://www.reddit.com/r/tifu/comments/q5pkjm/tifu_by_introducing_my_widower_dad_to_my_husbands
Oh I got one better. My stepfather’s father married his ex-wives mom making his ex-wife his sister. What a shit show during the holidays!
And no not backwoods BS we come from big money, its was a nightmare.
I had no skin in the game so I watched from the sidelines w/ popcorn…