Thank you for sharing your stories with us.
I’ve been reading your short stories and this is the first one I thought I could make a contributory comment, you write very well and I failed English so I make few comments there.
I enjoyed this little story, even though it was very dark. I liked the setup of the “Good” brother and really liked the twist you gave the last line.
The thing that drives this comment is the line, “ I cocked the trigger. Mattie yelped finally recognizing what I held. She too seemed frozen.” You do not ‘cock the trigger’ you ‘cock the gun,’ if it’s a revolver you can “cock the hammer“ because it’s exposed and you can see it. You can’t on most automatics. Also, you’ve indicated both windows were closed, both shattered when he fired, so how did he hear a Yelp, then she’s ‘Frozen’ so he couldn’t have assumed the Yelp from her movements. It stopped me and made me think for a moment.
Thank you again. I am enjoying your work. I’m still an amateur and learn from reading others that are better at the craft than me.
Stay safe, healthy and enjoy life, it’s still a wonderful place to hang out.