Aidan Gallagher is an actor, known for Nicky, Ricky, Dicky & Dawn (2014), Modern Family (2009) and Jacked Up (2013). Aidan Gallagher is an American actor. His first major role was portraying one of the quadruplet brothers, Nicky Harper, in the Nickelodeon television series Nicky, Ricky, Dicky & Dawn. In 2019, Gallagher began portraying Number Five in the Netflix series The Umbrella Academy. Show less «