Cool dad, alert! Ryan Phillippe [1] 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 [2]. Ryan also brought along his sister, Katelyn, and her daughter to get in on the fun. Ryan and ex-wife Reese Witherspoon [3] 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 [4]. Check out Ryan and Deacon's photos from their family time at Firefly Music Festival ahead.