And is it known if any of his progeny have yet reproduced successfully?
Orville's chicks with his first mate Victory were Sonic (P/07) and Shadow (P/08) in 2005. In 2006 they had four babies, Tempest (K/84), Thunderbolt (K/85), Velocity (K/86) and Zeus (B/03). Velocity sustained serious injuries and spent a long time in rehab before being released. I have not heard anything about sightings of the others, but that does not mean some of them don't have nests somewhere.
With his second mate Scout, Orville had four chicks last year: Justice (S/47), Mistic (S/73), Columbus (C/65) and Boomer (C/66). Since they are only a year old, it is unlikely that any of them would have nested this year.
This year they had four chicks once again: Aerial (65/H), Jet (66/H), Eclipse (67/H) and Apollo (50/A). Apollo died in a freak accident on June 9.