Jacob Daly is Ruby Daly's father. He worked as a police officer and was married to Ruby's mother, Susan Daly.
Jacob Daly appears only briefly. On Ruby's tenth birthday, she kisses him goodnight, ultimately erasing his memories of her. The next morning he doesn't remember her. He and his wife, Susan, lock Ruby in the garage and call the cops. The PSFs show up and take Ruby away.
In In the Afterlight, the camps are freed, and Jacob, Susan, and Grams find Ruby as they still remember feeling love and concern for her from before. At the hospital, she returns their memories. Her parents were protective of her from that point forward.
In The Darkest Legacy, Jacob was with Ruby at the park, when James Mercer attempted to kidnap her. Jacob was shot, but not fatally. He doesn't appear again in the book.