It's time to play "Keeping Up with the Mannings" ... with Peyton and Eli's older brother, Cooper Manning!!
Cooper -- who's a pretty successful oil and gas trader (safer than the NFL) -- was at LAX when we asked him a pretty great question ... if the Mannings were the Kardashians, who's Kim, Khloe & Kourtney??
You gotta watch the clip ... Cooper's answer is definitely NOT what you'd expect!
We also asked Cooper about a couple other things:
-- Do you get a "Manning Discount" at Papa John's?