Nicki Jhabvala of the Denver Post confirmed Kubiak will be their offensive assistant and quarterback coach.
Kubiak spent the 2015 season with the University of Kansas as a wide receivers coach and previously was in the NFL from 2013-14 as a quality control and assistant wide receivers coach with the Minnesota Vikings, per Alper.
He was a defensive back at Colorado State from 2005-2009 before beginning his coaching career at Texas A&M in 2011.
If Kubiak does join his father in Denver, he's walking into a pretty nice situation where his last name is a common one, as Jhabvala pointed out:
Nicki Jhabvala @NickiJhabvala
Three Kubiaks on the Broncos' staff now. Youngest son Klein Kubiak is a player personnel assistant.2016-2-17 00:04:21
However, there are some question marks in the Broncos offense looking ahead toward the 2016 season.
The Broncos won Super Bowl 50 during Gary's first year as head coach with the team behind a stellar defense and the aging arm of 39-year-old Peyton Manning. It is unclear whether Manning will retire, but Denver's offense will be in need of some work.
If Manning does call it quits, then the Kubiaks will have to continue to groom Brock Osweiler into the team's No. 1 man in an attempt to defend their championship—provided the 25-year-old re-signs—or look for help on the free-agent market or in the draft.
Denver's offense was ranked 16th in the league last season and will look to improve in order to take some pressure off its defense.