- Birth: (Date and Place unknown)
- Death: (Date and Place unknown)
- Partnership with: John GUERIN
Marriage: (Date and Place unknown)
- Child: John GUERIN Birth: 12 OCT 1872, Adelaide, South Australia
Descendants of Mary MCMAHON
1 Mary MCMAHON
=John GUERIN
2 John GUERIN
=Louise Bertha THIELE Marriage: 1 OCT 1898
3 Vera Agnes GUERIN
=Edwin Carl Albert WEGENER Marriage: 14 SEP 1922, Murray Bridge, South Australia
3 John Reinhold GUERIN
=Anna Florieda SCHULZ Marriage: 5 JUL 1930, Monarto, South Australia
3 Edmund Lawrence GUERIN
=Olive Agnes ROUSE Marriage: 9 MAR 1923, Murray Bridge, South Australia
3 Elfrieda Edna GUERIN
=Percy Robert PARASIERS Marriage: 23 MAR 1929, Murray Bridge, South Australia