I think it's the human condition ....
Death certificate is in: wrongly names her father as George East. Wrongly lists children as coming from two marriages, not three.
Albert Joseph is listed as dead. All other children dead at the time are identified accurately.
I'm not sure where this leaves us.
BTW:
The Harriet Williams journey:
Harriet Williams
in the Australia, Birth Index, 1788-1922
Name:Harriet Williams
Birth Date:02 Jun 1850
Father's name:William Williams
Mother's name:Amelia
Birth Place:Noarlunga
Registration Place:Adelaide, South Australia
Page Number:69
Volume Number:3
William McCourtie
in the Australia, Marriage Index, 1788-1950
Name:William McCourtie
Spouse Name:Harriet Williams
Marriage Place:Victoria
Registration Place:Victoria
Registration Year:1864
Registration Number:1436
Harriet McCourtie
in the Australia, Marriage Index, 1788-1950
Name:Harriet McCourtie
Spouse Name:Albert Joseph Derrick
Marriage Place:Victoria
Registration Place:Victoria
Registration Year:1875
Registration Number:4058
Harriet Derrick
in the Australia, Marriage Index, 1788-1950
Name:Harriet Derrick
Spouse Name:John Meatheringham
Marriage Place:Victoria
Registration Place:Victoria
Registration Year:1880
Registration Number:3505
Thanks again for all your help.
Rodney.