DEAR ABBY: My in-laws live 90 minutes away, so when they visit, they usually stay with us for a night or two. I don’t mind hosting them. They are delightful people, and we always have a good time. However, now that they’re getting older, I’m wondering what the etiquette is for sleeping arrangements. We don’t have a guest bedroom, so they sleep on a pullout sofa with a pillow topper. While they’ve never mentioned it, I know it’s not all that comfy, and I know they have some age-related aches and pains. When my grandparents stayed with us when I was a kid, they usually slept in my sister’s doubl…