Simon Brooks is the stepson of Edna Brooks and the son of Archibald Brooks.
Appearance
In "On the Waterfront Part 1", Simon was arrested by Crabtree for stealing a man's pocket watch. After he was brought home, Crabtree realized that his stepmother was his former love interest Edna Brooks (née Garrison), and covered for his crime. Though Edna didn't believe George, she allowed Simon to go get something to eat. The fact she didn't believe George's story implies Simon is a mischievous boy who regularly gets into trouble.
Over the course of the season, Simon builds a rapport with George, who was close to proposing to his mother, only for his father to return from the Boer War. At first they were happy, but Archibald began abusing Edna.
In "Nolo Contendere", Simon and his stepmother Edna are living in a secret location George gave them so that they wouldn't be questioned about Archibald Brooks' murder. Simon is eventually interviewed at Stationhouse 4, along with Edna, and it is revealed Simon accidentally shot Archibald, and intentionally lies about his killer, pinning it on one of his fellow soldiers upon spotting his own scarf that George gave him and when Brackenreid was staring intently on one of the photos. When his mother realized he was lying, they both went on the run following George's exoneration.