Hi Helen,
I noticed this entry in Surviving Co Antrim Cenus Records for 1851
17, Quay Lane, Larne. Co. Antrim
MATTHEW HERBISON, 24 ,Head, Married ,1844 , ABOURER ,Antrim ,R/W
MARGARET HERBISON, 30 ,Wife, Married ,1844 , NONE ,Antrim
WILLIAM HERBISON, 5 ,Son,Unmarried ,, AT NATIONAL SCHOOL ,Antrim
MARGARET HERBISON, 2 ,Daughter,Unmarried ,, NONE ,Antrim
JAMES HERBISON, 1 ,Son,Unmarried ,, NONE ,Antrim
I will have another look as I cannot see James marrying at 15 or 16 years of age
Christopher