Like father, like son
Sam spends a lot of his free time on the computer at home, so Luke has had a lot of exposure to the computer already. While he can't write any code (yet), Luke does enjoy playing a game of Baby Smash. Developed by a fellow programmer dad, in Baby Smash, a symbol and a sound appear every time a key is pressed. It's very rewarding for a little guy who likes to bang on the keys with both palms.
He's a computer prodigy in the making.