A family tree with hundreds of names, dates and places: where does it all come from? None of it is secret. A researcher collects it piece by piece from sources that anyone may use.
Archives have put many of these sources online. On websites such as Open Archives a researcher searches by name and finds the records. Genealogy Online helps with this through the Scans search service.
Everything about the last generations comes from people. From parents, uncles and aunts, from a marriage booklet in a drawer, from photos with names on the back. A researcher talks to family and writes down what they tell. So data about living persons always comes from the family, never from an archive.
A good researcher states for every fact where it comes from. In a family tree on Genealogy Online you see those sources next to the person. That way you can check for yourself whether something is correct. Read more about the rules for good research.
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Find your ancestors and publish your family tree on Genealogy Online via https://www.genealogieonline.nl/en/