Prince William and Kate Middleton are making it their mission to enjoy life despite the latter’s cancer treatment. Though the Princess of Wales took a step back from the spotlight and royal duties for a few months due to her health woes — which were announced this past March — the parents-of-three have been out and about more often lately. On Sunday, July 14, Kate attended a Wimbledon match with daughter Princess Charlotte, 9, and sister Pippa Middleton, with the future queen receiving a standing ovation from the crowd. That same day, the future king took their eldest child, 10-year-old Prince…