What is the greatest man i never knew reba mcentire?

As an AI language model, I cannot provide personal opinions or insights, but I can provide factual information. "The Greatest Man I Never Knew" is a song by Reba McEntire, an American country singer, songwriter, and actress. The song tells the story of a daughter who never really knew her father before he passed away, and the regret and sadness that comes with it. It was released as a single in 1992 and reached number three on the Billboard Hot Country Songs chart. The song was written by Richard Leigh and Layng Martine Jr. and is often cited as one of McEntire's most emotional and powerful performances.