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I located the civil birth record for Nicholas and a transcription of his baptismal record. The baptismal record has an entry which indicates he married a mary Anne Curley February 20, 1917. Nicholas had the following siblings ( you mentioned all but Henry) William 1877 Catherine 1880 Henry 1882 John Patrick 1884 Belinda Mary 1886 Rose Anne 1887
I was unable to locate a civil marriage record for the parents or a civil death record for Mary or John. I did find an 1876 church marriage record for a John Wall to a Margaret Fitzsimons which I assume is the correct record based on the date and first child.
Name:Nicholas WallDate of Birth:18-Jan-1879
Date of Baptism:19-Jan-1879Address:DuleekParish/District:DULEEKGender:MaleCountyCo. Meath
Father:John WallMother:Mary FitzsimonsOccupation:
Sponsor 1 /
Informant 1:John Warren Sponsor 2 /
Informant 2:Anne Meadth
MARRIED MARY ANNE CURLEY ON 20TH FEBRUARY 1917
Date of Marriage:16-Sep-1876
Parish / District:DULEEK
Husband JohnWall Address Duleek