Luke Alexander Sacco (born February 9 2005) is the third and youngest son of Elyse and Eric Sr. He has an older brother named Eric, an older sister named Ashley, and a fraternal twin sister named Lily.

When he appeared, Luke was still walking around with a pacifier in his mouth and it left his lips blistered, raw and sore. He and Lily rule the house with temper tantrums and they refuse to go to bed in their own rooms and sleep with their parents.

In the Submission Reel, Luke snapped the head off Lily's Barbie doll, making her cry.

Luke was 3 (almost 4) years old at time. As of 2018, he is 13 years old.