To start the genealogical research, only the first and last name of the primary person, as well as their date and place of birth, are essential.
However, the rest of the information you enter in the application form regarding parents and grandparents will serve to speed up the search, and to be able to contrast the documented information with that known by the family.
In the form you will also find an Observations section where you can freely write any comments or additional information.