JC,
thankyou for your informed guesswork that will help me extend all the siblings.
The LYNCH family is of the partner of my brother. The LYNCH family still own a family property on Valentia Island.
So far, I have not spotted this family on the Irish 1911 Census.
I shall, of course be delighted to hear from anybody who might have encountered this LYNCH family!
So far I have probable parents as:
David Daniel Lynch
1875–1961
BIRTH 3 OCT 1875 • Valentia Island, Kerry, Ireland
DEATH 1961 • Valentia Island, Kerry, Ireland
and
Johannah Bresnan
1880–
BIRTH 21 DEC 1880 • Doonvullen Upper Kilmurry, Limerick, Ireland
DEATH

Valentia Island, Kerry, Ireland
Their children are probably all deceased but include:
Mairead Mary Lynch
1907–2006
BIRTH 23 JUL 1907
DEATH NOV 2006 • Northampton, Northamptonshire, England
====
Kathleen Lynch
1909–1999
BIRTH 11 MAR 1909 • Coromore, Valentia, County Kerry, Ireland
DEATH OCT 1999 • Stoke Golding, Hinckley, Leicestershire, England
====
Joan Lynch
1911–
BIRTH abt 1911
DEATH Unknown
====
James Lynch
1913–
BIRTH abt 1913
DEATH Unknown
====
Patrick Lynch
1918–
BIRTH ABT. 1918
DEATH Unknown
====
Mary Lynch
1919–
BIRTH ABT. 1919
====
David Lynch
BIRTH Unknown
DEATH Unknown
====
and finally:
Dábh Lynch
BIRTH Kerry, Ireland
DEATH Unknown