Is this Jane Laverty and brother John in Main St, Larne in the 1851 census?
43, ARTHUR MAGILL, 30 ,Head,Unmarried ,, LABOURER ,Antrim ,R/W
ELLEN MAGILL, 28 ,Sister,Unmarried ,, SEMPSTRESS ,Antrim
CATHERINE MAGILL, 25 ,Sister,Unmarried ,, SEMPSTRESS ,Antrim ,R
JOHN MAGILL, 22 ,Nephew,Unmarried ,, LABOURER ,Antrim ,R/W
DANIEL MAGILL, 15 ,Nephew,Unmarried ,, SHOE MAKER ,Antrim
Died Since 6th June 1841:
DANIEL MAGILL, 76 ,Father , FARMER , Old Age , Autumn 1846
SARAH MAGILL, 39 ,Sister , NONE , Consumption , Spring 1844
JOHN LAVERTY, 50 ,Head, Married ,1824 , LABOURER ,Antrim ,R/W
ELLEN LAVERTY, 40 ,Wife, Married ,1824 , SEMPSTRESS ,Antrim ,R
JAMES LAVERTY, 23 ,Son,Unmarried ,, LABOURER ,Antrim ,R/W
ARCHIBALD LAVERTY, 19 ,Son,Unmarried ,, LABOURER ,Antrim ,R
THOMAS LAVERTY, 17 ,Son,Unmarried ,, LABOURER ,Antrim ,R
JOHN LAVERTY, 13 ,Son,Unmarried ,, LABOURER ,Antrim ,R
JANE LAVERTY, 15 ,Daughter,Unmarried ,, LABOURING ,Antrim
HUGH LAVERTY, 11 ,Son,Unmarried ,, NONE ,Antrim
ELLEN LAVERTY, 7 ,Daughter,Unmarried ,, NONE ,Antrim
MARGARET LAVERTY, 5 ,Daughter,Unmarried ,, NONE ,Antrim
Died Since 6th June 1841:
FRANCIS LAVERTY, 7 months ,Son , NONE , Inflamation of Bowels , Summer 1845
Tradition was to marry in the bride?s church, so that?d be the place to look for her baptism and that of siblings etc. If Robert McKay came from Cairncastle then you could look in the records for the churches there for his baptism (Presbyterian and Church of Ireland I would think). Copies are kept in PRONI, Belfast. They are not on-line anywhere as far as I am aware.