Prince Harry “will make efforts to see Princess Kate and Prince William” during his visit to the UK in May, a royal source has claimed. The Duke of Sussex is expected to return to Britain in May this year to mark the 10th anniversary of the Invictus Games. Royal author, Tom Quinn, has said that Prince Harry will make an effort to see his brother and sister-in-law following her recent cancer announcement. On Friday evening, the princess released a video message revealing that she had been diagnosed with cancer. Quinn said: “Given Kate’s cancer diagnosis, Harry will certainly make efforts to see…