When I had family of my own I made it a thing that we had our own family holidays, just the four of us, as we both worked hard and needed a break.
Day trips with extended family? Yes, but a week? Good heavens no, not my idea of rest or fun at all.
Now I have grandchildren I am glad they do the same. Sometimes I have 'joined' the holiday for a few days but stay the whole time? No chance. I have breaks with my friends, with other family, with my daughter even, but not a 'family' holiday.
Horses for courses I suppose. Life is change. Let them go away together and accept it. There is no point in creating conflict about something which should be fun and relaxing.
What if your son insisted on your coming? What that make you feel better? I know I wouldn't feel comfortable at all.
Why not just go away with your son? It sounds like he could do with a break and may show his wife he has a life of his own too, and is free to make choices as we all are.
Sometimes it’s just the small things that press the bruise isn’t it? 😢

