Pretty rude, if I may say so.
Even more bizarre. You mean, like “Fido” or “Cuddles”?
And there I was, thinking you were a good Catholic girl. Tsk! The youth of today…
hehe, roger thornhill thinks I’m Catholic… I’m 1/2 Protestant, 1/4 Jewish, 1/4 Catholic (the product of 2 generations of mixed marriages) and currently Presbyterian! I’m irishgirl, not “sterotypical irishgirl”.
Otherwise, you know exactly what I mean, you bad, facetious man! 
(Mr X and Mrs Y if you prefer, and my grandmother goes by “Hooa”)
I call my MIL Mrs. (Lastname). I started out doing so and it never changed, even though we get along very well and are otherwise informal.
In Dutch, the problem can’t be avoided as easily as in English, because we *have * to choose between the polite and formal adress “U” and the informal “jij”. In English those are both served by the ambigious “you”, and you people don’t know how much trouble that saves you.
At what point in your relationship did he go from calling your dad “Dr. Such-n-such” to [his first name]?
sheepish grin I just sent them an email asking what they’d like to be called. Interesting timing, actually. There’s been family drama this month over what the children should call the various grandparents and aunts and uncles, and I realized while reading this thread that even I don’t know what to call the in-laws myself! 
I apologize for the hijack.
It’s not what they’ve done for me that caused me to call them that (although they’ve done quite a bit). But more that they treat me as their own daughter. The same love and concern that I get from my own mother I know I can expect from Rhoda. I’m not trying to place any obligation or responsibility on their shoulders; rather the terms are honorific toward the depth of feeling we have for each other.
My daughter and son have friends in my house just about every day when I come home (yes, I’m that mom.). Eating my food, playing the kids’ video games, etc. More than one of them calls me mom. I look on that as a compliment. And I’m not insulted that Stephen calls his best friend’s mother “mom.”
I don’t have that kind of in-laws, but everybody I know calls them either by firstname or “Mom Firstname” and “Dad Firstname”. My brother calls them by firstname, my SIL calls my mother by firstname. My mother and her co-sisters-in-law would sometimes call their common MIL “Abuelita” but it was because she happened to have the same firstname as my mom and her own daughter - so if you said “Maite” it was confusing; when all 3 were together they became “Abuelita”, “Maite Blonde” and “Maite Brunette”. This is in Spain, in case the OP finds it useful.
A rightist? You kidding? Come on, I’m not THAT politically rabid. I call rightists names like “Nana”, “Papa”, “Aunt/Uncle (firstname)”, “professor”, and “milroyj”.
I’d tell you what he is, but the thread would get depressing. You got the “r” and the “ist” part right, though.
C’mon, you could’ve said from “Dr. Mercotan” to “Qadgop”! His username works so well that way!
As for your question, I don’t remember.
I’m with you on this, Dangermom. My brother’s wife of 15 years still doesn’t address my parents by anything, and they are highly offended. My parents do have their moments, but for the most part have been very welcoming, and even mentioned that she could call them whatever she feels comfortable with. So, Biggirl, I have to respectfully disagree with you; people do notice. At least in anything but the most anonymous or superficial of relationships.
I call my girlfriends parents by their first names.
My doing this has caused them to realize that their daugher-in-law and son-in-law-to-be do not call them anything.