Princess Kate and her children have retreated to the country with Prince William. But duty calls the heir to the throne.

What will happen next? What will happen after King Charles and Princess Kate's cancer treatment is anyone's guess. The 41-year-old will visit a food redistribution charity in Sunbury-on-Thames, Surrey, on April 18. Then the plan is to visit a youth center in west London that benefits from the charity's work. The prince goes to work with a doubly heavy heart, especially since not only his wife is undergoing chemotherapy for an unspecified type of cancer, but his father King Charles (75) is also suffering from cancer. A public return for Kate, who first stepped away from royal duties in January following planned abdominal surgery, has not yet been announced.