I have used Brian Lawson's excellent new census index to try to locate some of the children, to see whether this throws any light on the Kerruish family origins (I should have used it yesterday for 1851). When entering his Piece and Folio numbers there is no need to put in any name at all, which is immeasurably better than the Ancestry index where I am finding a 50% + rate of at least one error per entry.

William Kerruish was aged 12 in 1841. Bapt 22 Feb. 1829 Andreas. No luck finding him, with too many Williams. - Unless his birthplace was Ramsey, or he thought it was Ramsey.
In 1861 there is a William Kerruish in Ramsey, Bobbell? Alley Lane (next to a College St entry), mar, 33, laborer, b.Ramsey, with wife Mary 35, children Ellen 8?, Emma 6?, Thomas 5?, Robert 3, William 2, all b.Ramsey. Possibility?
William Kerruish & Mary Corteen marr. 3 April 1853 Ramsey?

Margaret Kerruish was aged 9 in 1841. Bapt 4 Dec 1831 Andreas.
Married John Kneale 17 May 1855 Ramsey?
Again her place of birth in the 1861 census differs from her bapt. If the right Margt, she is at Queen St Ramsey, Hd, M, 32, Mariner's wife, b. Lezayre, with 8 children all b. Ramsey.
In 1871 she is at 1 West Quay Ramsey, a widow, 41, Inn Keeper, b. Lezayre with several children b. Ramsey.

Catherine was aged 1 in 1841, bapt 28 June 1840 Andreas. She was with brother Daniel in 1851. She could have married Silas Moore 25 May 1865 Lezayre (see 1881 census where their ages are the same) and their ages given on the IGI for the marriage could be the wrong way around? Worth checking?

So many could, if, and but!

Sue