John Legend’s six-year-old son, Miles, recently got a “life-changing” diagnosis, and now Legend is opening up on how it has impacted their family. For almost two decades, John Legend and Chrissy Teigan have been one of the most talked about celebrity couples. From meeting on the set of his music video in 2006, tying the knot in 2013, to having four children together, they are the statement of true love in Hollywood. Despite their happiness, the pair have been dealt some heartbreak over the years, and have always tried to share this with the public. Their latest hurdle is no different, as John …