In today's Miss Manners column, advice columnist Judith Martin responds to navigating the etiquette of children's birthday parties as a non-parent.

It seemed like a way to invite me to a party, while sending a seemingly mixed message that I’m not really invited after all.

"Wishing Prince Louis a very Happy 7th Birthday! 🎂" read the caption of the post. The photo was taken by photographer Josh Shinner. The royals also shared a short video on Instagram that showed ...