2nd last column has John’s death as 5 Oct 1854, aged 64 and Mary Swan as 4 July 1851, aged 51:
http://nla.gov.au/nla.news-article101874380The article refers to a Thomas, who is actually their son Charles.
Children:
Marriage: 3620/1872 BARDWELL George to NISCON Eliza J WAGGA WAGGA
Death: 14380/1893 BARDWELL Eliza J parents JOHN B and MARY WAGGA WAGGA
Death notice, 4th column:
http://nla.gov.au/nla.news-article162197139Obit, 1st column:
http://nla.gov.au/nla.news-article101831216Marriages: 694/1855 V1855694 123 NIXON John to PARSONS Ann M OL
7780/1891 NIXON John to ROSSINGTON Emily E WAGGA WAGGA
Death: Obit for NIXON John, 1901, 3rd column:
http://nla.gov.au/nla.news-article101852389Children:
11529/1857 Mary J
12644/1858 Anne M
13151/1859 NIXON John B died 6150/1870 NIXON - Inquest, last column:
http://nla.gov.au/nla.news-article10408836713671/1861 Clarissa C
14335/1862 Emily E
15673/1864 Charles R
16951/1867 William G died 10001/1878
18959/1869 Male died 6282/1869
18176/1870 Alfred Richard died 8156/1874
Marriages: 1823/1858 NIXON Robert to MURCHISON Flora GUNDAGAI
4041/1874 NIXON Robert to PALMER Sarah Anne WAGGA WAGGA
Deaths: 8172/1903 NIXON Robert parents JOHN B and MARY WAGGA WAGGA
7009/1872 NIXON Flora father DUNCAN DIED WAGGA WAGGA WAGGA WAGGA
Obit, 3rd column:
http://nla.gov.au/nla.news-article104040189Children:
14323/1863 Margaret J died 6056/1864
15960/1865 Robert J
16966/1867 Florence L
Died 8128/1867 Christina M
18857/1869 Margaret W
18129/1870 Kenneth Duncan
Marriage notice, 1st column:
http://nla.gov.au/nla.news-article12989122Death: 7320/1910 GIBBS Mary A parents JOHN B and MARY TUMUT
Death notice, 1st column:
http://nla.gov.au/nla.news-article145411091Marriages: 2762/1858 NIXON Charles to MALLYON Elizabeth A WAGGA WAGGA
Marriage notice, 1st column:
http://nla.gov.au/nla.news-article130210535949/1883 NIXON Charles to JOHNSTONE Charlotte E
6080/1885 NIXON Charles to KENNINGTON Mary J
Death: 1565/1914 NIXON Charles parents JOHN B and MARY WAGGA WAGGA
Obit, 2nd last column:
http://nla.gov.au/nla.news-article221556000Obit, 2nd column:
http://nla.gov.au/nla.news-article141862171Children:
Mother Elizabeth:
13674/1861 John H died 14840/1941
Died: 6139/1862 Maria E
15543/1864 William R died 22361/1947
16025/1865 Ernest J died 20475/1930 - Obit, 2nd last column
http://nla.gov.au/nla.news-article14268475317117/1867 George A died 22152/1953
Mother Charlotte:
26371/1884 Charles H B died 15134/1976
Mother Mary:
28059/1886 Lily M
29531/1888 Frank B died 11805/1889
35339/1891 Violet M E J died 12977/1892
35962/1892 Lavinia J E
27658/1895 Florence M
35412/1896 Muriel A
27032/1900 Bessie M
An interesting write-up about the Nixons, 1st column:
http://nla.gov.au/nla.news-article122184558Jamjar