We don’t know the details to give us the perfect scenario, but jumping under the bed when the homeowner comes into a bedroom with a gun wouldn’t be so surprising, if you are trapped.
This should be fairly easy for the grand jury to figure out if a terrible mistake happened, or if dad took liberties to kill the boy.
If he murdered the boy, then I hope they get him.
IMHO, the daughter should be charged with his murder. She lied and created the situation where her father believed he was justified in killing him.
It should be the same sort of felony murder situation where a getaway driver is charged when a liquor store clerk kills a robber.