Been with dh 14 years, married for 7.
When we married I didn't change my name, I kept my own. I have my reasons but really it's irrelevant. I knew some people would presume I'd change my name, so I told dh to mention to his parents that I'd kept my name, just so that there was no confusion. I go by Ms Crazyrunninglady, that's my legal name.
Over the years in laws have repeatedly called me Mrs dhinitial Dhsurname.
I asked dh to politely correct them, then for a time they started double barrelling my name. Which is also totally incorrect. Now they've gone back to Mrs Dhsurname.
Dh says they're confused. They're not elderly, they don't generally get confused.
Would you, a) ignore b) ask dh to tell them c) tell them yourself
My main problem with c) is that I suspect they already know and are doing it deliberately. I know they'd be dismissive of my reasons. Fil would pull a face, stick his opinion in and this would cause friction.