One of my aunts had her first child in the 1870s. About five years later she married a local man with whom she had several children. The date of their marriage is confirmed with marriage records from the county in which they lived and from the church they attended. The husband died several years before the wife and when his estate was probated the oldest child (who survived her mother and her mother’s husband) was not listed as an heir to his intestate estate while all the children born after the marriage were. Records from a court case initiated after the death of the aunt’s parents mention the first child and specifically name her father–a name that was not the husband’s. Census records and details from the court case after the aunt’s parents’ deaths indicate that the aunt’s oldest child actually lived with her parents.
But there are a few relatives that have approached this in a different way. The date of the aunt’s marriage has been tweaked to make it appear that she married her husband before this child was born and have listed the husband as her father.
Gentle convincing has not been successful. Asking for evidence that the date from the county recorder’s office and church records is incorrect has been met with no answer. Asking why the child is not listed as the husband’s heir is met with no answer. Sometimes you are unable to convince people.
Report what you find and move on.