|Neil Patrick Harris|
He told Parade magazine: "I love watching them learn to understand language. And watching them interact with each other is fantastic. We're lucky that we have two because they always have a playmate and they get to learn complicated concepts like sharing and cooperation.
"They get to learn those things a little earlier because they're with each other all the time. Watching their minds tick is fun."
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The 38-year-old star also feels fortunate that he's able to juggle his time between acting and fatherhood without any issues, and he is in a "nice position" where he can pick and choose his roles.
He added: "I have an unbelievable assistant who handles all of my scheduling! It's like a Tetris game. I've been doing this for a while and sometimes you have spells of busyness and other times you're clamoring for work. It's nice to not be put out by being so busy, but to try to embrace it and make smart choices.
"I guess I'm in a nice position that way. I get to choose things that interest me as opposed to trying to get any job that will have me, which for a vast majority of actors is the case."