Alex Griswold (born October 9, 2007) is the fourth and youngest child of Roberta and Allen. He has two older sisters named Brianna and Lauren, and an older brother named Joe.

He was a typical toddler who liked getting into things and making messes. He was rarely seen during the episode, except when greeting SuperManny, getting chewed out by Allen for not closing a drawer fast enough, and standing on the sidelines during Joe's various tantrums.

On SuperManny in 2010, he was 2 years old, and is now 10 in 2017.