For Dutch roots in general, Sephardic or otherwise, see http://www.genlias.nl/en/page0.jsp
For almost 200 years the Dutch authorities have been recording births, marriages and deaths in the Civil Register. Genlias provides you with information from these official records.
A record of birth provides you with the following information:
the name of the child
the names of the parents
the exact date of birth
In most cases, the parents' address
A record of marriage provides you with the following information:
the names and ages of the bride and groom
in most cases, the names of the bride's and the groom's parents
in most cases, the places of birth of the bride and groom
whether the bride is a widow or the groom a widower
in most cases, ages and professions
A record of death provides you with the following information:
the name of the deceased
the exact date of death
in most cases, the name of the deceased's parents
in most cases, the age of the deceased
in some cases, the deceased's place of birt
in some cases, the name of the deceased's spouse
in most cases, the address of the deceased
At present, the following records are in the public domain:
records of births prior to 1903
records of marriages prior to 1933
records of deaths prior to 1953