Given the time of night that this occurred and the Father feeling comfortable enough to answer the door at that hour, it's my feeling that he may have known the shooter(s). Yes, as others have posted, Jayme I'm guessing was the target. I wonder if the Father came armed to the door? If he knew the person/people at the door and felt comfortable with them, then he probably didn't. If he did, then the bad guy(s)/gal(s) probably took the weapon from him after they shot him.
All speculation on the last part with him coming armed to the door, but sounds as though, based on the positioning of his body, he was either escorting someone out of the house or answering the door.
Going to take a break and return tomorrow to see what new info is here.