Who is the son of the son of former Saints coach Bum Phillips that coached for both teams in the Falcon, Saints rivalry?
Morten Andersen:  He is the all-time leader in games played in the NFL at 382; in addition, he also holds the distinction of being the all-time leading scorer in NFL history, and when he retired he was the all-time leading scorer for two different rival teams; the New Orleans Saints, with whom he spent 13 seasons, and the Atlanta Falcons, with whom he spent a combined eight seasons. Falcons–Saints rivalry:  They have also drawn coaches from the same families, and even shared a head coach: recent Falcons coach Jim L. Mora is the son of longtime Saints coach Jim E. Mora, and former Falcons and Saints coach Wade Phillips is the son of former Saints coach Bum Phillips.
Wade Phillips