Erin Grace Matthews-Cooke (born March 8, 2001) is the youngest of Paul and Denise. She has two sisters, Meghan and Gabriella.

Erin was 4 years old when Jo came to help her family.

She was 6 years old when Jo last visited her. Erin was misbehaving like Meghann 2 years ago during the last show with Jo.

in 2016 Erin was the subject of an Irish Dancing based documentary series, "Jigs and Wigs".

Erin now lives with her dad Paul as of 2017.

She is now 17 in 2018.