The DEC gave dad a few rubber .12 ga sabot loads and he shot one square in the back-side. (Thanks to Army training.)
The bear was back a day or two later. Once they get a taste of garbage and chickens, they will never change. (We are way in the country btw - in a place they used to relocate them too, with an active hunting season. )
As for that bear, the DEC came and shot him on the front lawn.