Favre confirmed to ESPN that his daughter, Brittany, has given birth to a son. The Minnesota Spokesman-Recorder had reported late last month that Brittany, 21, was expecting.
It's unknown how many grandfathers have been on active NFL rosters before.
Favre hasn't given the Vikings a timetable for when he'll make a decision. He dropped by the spring practice of the Southern Miss. football team on Monday, and coach Larry Fedora said Favre gave no hints on whether he'd be playing again.
Read more stories moms are talking about.