FTR
I think that this family had at least seven children if not nine
I have listed seven below with details or links
Josephine CHALLIS nee FARRELL died in 1919
She is buried in Deansgrange in plot J2 84S
Also buried in that plot is: Anne Josephine (1888) and Edwin (1903)
as well as two infants described as the children of John CHALLIS
male infant buried on Jun 18 1901 of 10 Sextons Cottages York St
infant buried Sep 12 1904 of 10 Avoca Sq York Rd Kingstown
Elizabeth is buried in plot X 52 S in the same cemetery
Link to marriage on Jan 31 1886
LINKDec 12 1886 John Denning
LINK #359 - registered as John DENNING
Dec 28 1887 Anne Josephine
LINK #96; died 1890 Rathdown Q3 V2 P607; Buried Deansgrange Jul 06 1890
May 30 1892 Sarah
LINK #15
Nov 12 1893 George
LINK; died Nov 18 1929
LINK #278
Feb 06 1895 Edwin
LINK #56; died Jan 28 1903
LINK #
Sep 09 1896 Martha; bap Oct 04 1896 Monkstown
Jun 12 1898 Elizabeth
LINK #330 ; died June 12 1898
LINK #171
it doesn't locate John but gives you more to think about!