A witness to a document is simply testifying that they saw a person sign (or execute) a document and that they know who that person is. Witnesses do not have to have any relationship to the person executing the document although they have to be old enough to legally sign a document themselves. Do not assume that witnesses are related to the person signing the document. The witnesses could simply be other people who happened to be nearby when the document was signed. They could even be the person who wrote the document if your ancestor only signed the document and did not actually take pen to paper and write it himself.
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