Not your land , not your call .
Keep rocking the boat and you may find yourself looking for somewhere else to hunt from now on . Trying to fuss over a guy hunting without his wheelchair bound kid only makes you look like a jerk , your family obviously knows he does it and doesn't care . The guy has a lot bigger problems than hunting access , and your family has decided to be nice to him , and I don't blame them one bit . Frankly , I think you're being a dick about it , and very childish . Get your own land and you can control it any way you want , but you have zero right to decide what happens on someone else's .

Get over it .