Grandpa Napoleon is a boss in Tower of guns, he is a bigger tankier version of the Napoleon enemies and as such require care to take down.
Dodge the bullets he fires while returning fire yourself, he's rather large and fairly slow, keeping a stream of bullets on him shouldn't be too hard.
Great-Grandpa Napoleon Edit
At difficulty levels 1500+ It is possible to see a Champion version of this boss. Getting here will take a few playthroughs of endless mode. Standard starting difficulty (not picking toyoungtodie or nightmare perks) is 100