Prince William honors Princess Diana on Mother’s Day with a rare childhood photo and heartfelt message remembering his late mother and her lasting influence.

The Prince of Wales has shared a never-before-seen photo of the late Princess Diana in a poignant Mother's Day message.

According to The Telegraph, the photo—which the outlet reported was “from the family’s private collection”—was taken when William was 2 years old in 1984 at the family’s country home at Highgrove in G...