Cool dad, alert! Ryan Phillippe and his teenage son Deacon attended the Firefly Music Festival over the weekend, and to say that they had a blast would be an understatement. The look-alike father-son duo hung out at the Delaware event, where they wore matching bandanas, watched Gucci Mane perform, and even spent time with Post Malone. Ryan also brought along his sister, Katelyn, and her daughter to get in on the fun. Ryan and ex-wife Reese Witherspoon share two kids — 19-year-old Ava and 15-year-old Deacon — and the genes are strong! Ava is a nearly identical miniature version of Reese, and the same goes for Deacon and Ryan. Check out Ryan and Deacon's photos from their family time at Firefly Music Festival ahead.