UPDATE: How does this sound? (image below)

I’m (I’m 16) writing an email to a potential employer (for a summer job) who I have met once before and who has employed my brother. What should I put in the subject line of my email. I want to come across as respectful but friendly. Thanks for the help! Picture of one of said employer’s cars (*cackle*) for your time (Courtesy of Will Mederski).