The Rookie star Nathan Fillion has shared a sweet tribute to his father, Bob, and older brother, Jeff, in a belated Father's Day post on social media – and the resemblance is uncanny!

For Nathan Fillion family is everything. The actor – who enjoyed a happy childhood in Edmonton, Canada – is extremely close to his parents, not to mention his older brother Jeff. Speaking ...

just because I knew his dad so well. What was funny is, when they said, ‘Nathan Fillion,’ I didn’t know who he was. I just remembered, ‘Oh, there was that really cute guy in Serenity.