If he’s lying, throw the book at him. And in any case, if he has any sort of conscience he has to live with the knowledge that a stupid game resulted in the death of his own child. If it were me, that would be worse than any punishment the judicial system could prescribe.
People who abuse weapons should not be allowed to own them.
There is no right to endanger everyone else. His own kid geez what an imbecile. What kind of man points a real gun at a kid?