Both my father and my wife's father are diabetic, my father in law decided to go Paleo and my dad decided to just eat lower carb. So both houses are pretty adept at keeping carbs low and providing options. However both found out they were diabetic after we started keto. Before their conversions the toughest sell on keto was my momma, but she soon adapted and started to work up low carb recipes with my wife. That is how "fauxtato salad" came into being. My mom makes the BEST potato salad in the world. She still does, only now it's roasted radishes, steamed cauliflower and her signature dressing and seasoning. If she could only replicate a low carb version of her sour cream chocolate cake.
My default restaurant meal is a Cobb or Chef Salad or a grilled chicken salad. Usually with blue cheese dressing. Or I just get a steak and some grilled vegetables. I know from trial and error that I can get into the 35-45 carb range and remain in ketosis, where my wife can go into the ridiculous 70-80 carb range and not get kicked out. When we are on vacations, eating out or at events the goal is always to just stay in ketosis and not fret the 20 carb keto restriction. Always, of course, followed by a fast and lots of water.