Re: My son/daughter is never wrong…
If they’re coming to live in the house you share with your husband…then they’re in YOUR domain. Meaning you should try your best to control the “topics” that come up.
Avoid talking about your husband in front of them. Its obvious that your in-laws don’t get your “jokes”…so why bother? Save those jokes for your friends.
My MIL loves to talking about cooking and decorations and her 3 year old granddaughter. I know these things by now. So if I see a possible topic coming up that might cause me to be upset…I just change the topic. I randomly ask her if she has any new pics of her granddaughter…I randomly ask her something about cooking (example: "Oh btw, when you get a chance, will you please teach me how to cook that xx dish you made) etc. Not only does it change the topic…but MIL becomes happy b/c I give her a chance to ramble about stuff SHE feels passionate about.
You already know their personalities…their likes/dislikes. In order to minimize your own tension/headache/sanity…learn to manipulate it. 