The entire world of Old Man Logan is a bleak, cynical wasteland full of horrible perversions of classic Marvel characters. The plot is basically that of the famous western Unforgiven. Logan has buried the violent Wolverine part of himself and is living a new life with his wife and kids on a farm. Everything is peaceful until the day the Hulk Gang shows up and demands Logan pay them, or they’ll kill his wife and kids.
Nothing in Old Man Logan‘s nihilistic wasteland is as disturbing as the Hulk’s brood. It’s assumed, though never explicitly stated, that the unholy abominations that sprung from Banner’s loins also procreated with each other. How do we know this? Because the Hulk Gang that comes after Wolverine demanding money are the grandchildren of She-Hulk and the Hulk.