Hello Teresa,
I can't see a marriage here are the children listed to John MCGOLDRICK and Sarah Ann MADDEN on the Index:
1. John Edward d 1872 aged 9 Months Collingwood # 7269
2. Patrick b 1873 Melbourne N # 4183 d 1873 aged 7 Months Carlton # 9237
3. Catherine b 1876 Richmond # 25317
4. James b 1878 Richmond # 4654
5. Edward b 1879 Richmond # 18800
6. Michael John b 1881 Richmond # 11691 d 1883 aged 2 Melbourne S # 5838
7. Margaret b 1882 Melbourne # 25185
8. Robert d 1885 Richmond { no age given} # 20929
I also cannot find them coming in to Victoria

There is this might be John can't be sure:
MCGOLDRICK J 29 MAR 1868 GOTHENBURG N 083 006
Sorry I haven't been of much help really

I also checked SA just in case-nothing there either.
Regards
Alison