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I need public data about persons / parent-child relationships, especially relating to the past. I am creating an awesome family tree app, and I want to help people to build their extended family tree.

Where I am able to reach public global / local databases to show use person relationship information? Is there any available global distribution system I could use?

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    I'm not an expert in this arena but I would start by going to en.wikipedia.org/wiki/… and looking at their sites to see what their data sources are. Some probably have none while others offer a look up service. – Mark Silverberg Nov 9 '14 at 14:36
  • I think the key to build family tree is, after user used all info based on family memory, can you find and use matching point with other users' family tree, and / or App feeds you with data comes form digitalised birth / marriage certificates – János Nov 9 '14 at 16:32
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There are a lot of paid services that provide this type of information, such as Ancestry.com. They are unlikely to offer access to their highly curated content.

However, the Church of Latter Day Saints at FamilySearch does provide a free service for others to use. That site provides developer resources specifically for people like you, and encourages others to build apps using APIs and accessing their data.

Data formats are described in more detail here.

Good luck!

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