I want to know what the father was really doing. While it is an acceptable explanation that he thought there was a prowler around, I find it hard to believe that after that kind of scare (Honey there's someone outside, go get the kids and stay in the living room! or Honey there someone outside, I'm going to get my gun and check) that the parents wouldn't be more attentive to the situation. If I need to pull a gun out to go check out a possible danger to my family, my family knows it and is not casually laying around the house watching TV and Facebooking.
It is more likely the guy was outside shooting things for fun, came back in the house and left the gun on the table. It just sounds better to say he was trying to protect his family.