Never assume relationships with families of the same name.
Always start from what you know and base your research on a firm line of descent using the available records.
Many hand written letters can be mistaken for other letters in the alphabet, for example, Gabriel de Milhau can often be found in records listed as Gabriel de Milhan.
Similiar spelling of names should also be considered, for example, Andersen and Anderson or Brennan and Brannon.
Researchers unable to check the indexes or registers may contact the NSW Registry of Births, Deaths and Marriages, where, for a fee, searches are undertaken and copies of certificates supplied.