There is a chance someone might have already researched your family tree. Their work may be online or in the form of a published book. Do a check for these things before devoting too much time to a family line. However, do not take everything published online or in a book as gospel, either. Make sure anything you find has sources, and check for yourself to make sure those sources are correct. Only then can you use someone else’s research in your family tree; if you do, be sure to give them credit in your own source citations.
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