Once a Killer
A twelve year old boy shoots his abusive father who is trying to choke his mother. He runs away, is taken in by a mentally ill woman who wants to keep him since her own son died some years ago. The boy eventually breaks free and returns home to discover that his father is still alive but his mother is dead, most likely at the hands of his father. The next morning the boy shoots his father again, this time fatally, then burns down his house and runs.
LongLinePenpusher
When he escapes from a woman who wants to keep him, a runaway boy must decide what to do with his abusive father when he discovers that he survived the first attempt to kill him.
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Sounds intriguing but I think the logline could use some work so it matches your additional story premise shared.
Maybe something like “After running away from home following shooting his abusive father to save his mother, a preteen boy escapes domestic captivity and returns home to discover his father is still alive and his mother is not.”
I dunno. That’s my stab at it. I feel like the story needs a little more drama element to make it more enticing.