Jacob Harmony (born November 26, 1978) is the father of Ian and Grant, stepfather of Jake and husband to Erin. Jacob was born in New York, NY.

He usually ignored Ian and Grant's naughty behavior. He held Grant down while Erin was trying to go on an errand.

He was 27 years old during his appearance on Supernanny and now 40 years old in 2018.