Found the following in the 1851 Castletown census:

Dist: 2/Page: 43/Entry: 31

CORRIN, William/22 Malew Street/Head/Married/37/Shoemaker/Arbory

CORRIN, Margaret/22 Malew Street/Wife/Married/37/Castletown

CORRIN, Margaret/22 Malew Street/Daughter/12/Scholar/Castletown

CORRIN,Catherine/22 Malew Street/Daughter/9/Scholar/Castletown

CORRIN,Deborah/22 Malew Street/Daughter/7/Castletown

Did NOT find John - aged abt. 20 years.