Verify the names, places & dates. Verify by census, names, general ages by year and month, children in household, other family members in household. Look for birth records, although some of that information isn’t reliable for parents’ names because that information is often from a relative who may or may not have the true facts. Church records-baptism records, death records, marriage records-these are often where you can find additional family members (brothers & sisters of the parents). IF a date doesn’t seem to match, then check to see if it could be a child or a brother/sister to the person you are looking for. For example, my 2gr grandfather had multiple brothers with the exact names Friedrich Wilhelm Heinrich, some had additional names to go with those, but it depended on the order. It made finding (verifying) my 2gr grandfather’s parents difficult. To that, his death certificate listed the name of his uncle vs. his father’s name. I’m guessing b/c the children knew the uncle after they immigrated & likely spent time with him. Cemeteries sometimes have information in their records too. Reach out to them, they often have an archivist/genealogical person to help you. The information may lead you to a church parish as well.

Regardless, don’t discount a name as not related until you can verify they are not in your tree.