While parents in the U.K. celebrate Mother's Day on a separate date than moms and dads in the U.S, Father's Day is observed simultaneously. And this morning, as dads in both countries are being treated like kings, the British royal family is marking the holiday by posting sweet photos on Instagram. The pictures range from a portrait of Charles with his two sons, to a sweet snap of Prince William playing with Prince Louis, and a never-before-seen photo of Prince Harry and Meghan Markle's one-month-old son, Archie Harrison. Read on to see all the royals' Father's Day posts this year.