Janeway was the married father of two daughters. One of his daughters, Kathryn, was the former captain of the USS Voyager. The admiral died under the ice cap of Tau Ceti Prime in 2358. (VOY: "Coda") His widow was still alive as of 2378. (VOY: "Author, Author")
When Kathryn was a child, Janeway and his wife took Kathryn and her sister on backpacking trips. They considered it was important that they should all keep a connection to their pioneer roots. Similarly, Janeway and Kathryn hiked the north rim of the Grand Canyon when the latter was nine years old, which he called "Earth's biggest ditch." (VOY: "Resolutions", "Imperfection")
Vice Admiral Janeway, as assumed by the matrix alien, was played by Len Cariou. He was described in the script as "a man in his 50's, dressed in a Starfleet Admiral's uniform of some fifteen years ago. He is a pleasant-looking man with grey eyes and salty hair."
His first name was given on an okudagram in "The Killing Game"; see the talk page for more information. He is given a different and longer first name at StarTrek.com where he was named Edward Janeway.
A wardrobe error incorrectly placed a 2370s combadge on the admiral's uniform Janeway supposedly wore in the 2350s. His Starfleet uniform was unlike any we had ever seen in Star Trek, but other admirals of the same era wore different uniforms, as evidenced by Mark Jameson and Gregory Quinn in TNG Season 1, circa 2364.
Admiral Janeway's death was also featured in Mosaic, a novel by Jeri Taylor. Taylor created the character of Janeway, and established in the book that his first name was Edward and that he drowned during the testing of a prototype ship, an accident which also claimed the life of Kathryn Janeway's fiancé. Admiral Janeway also appears in The Lives of Dax short story "The Music Between the Notes".
In the anthology series Distant Shores, the framing story looks at Admiral Kathryn Janeway experiencing what appears to be a vision of Seska encouraging her to look back on her life, eventually apparently offering Janeway the chance to avoid Voyager being trapped in the Delta Quadrant in the first place, but she eventually rejects this illusion, recognizing it as another attack by this creature.