Shocking Confession
When my grandmother was on her deathbed, she gave a shocking confession. She told her oldest son that he actually had an older sister somewhere back in their home country. She gave birth out of wedlock (not sure with my grandfather or not) and gave her away. My grandmother said she regretted not telling her kids and keeping a family relationship away from them.
My family ended up finding the girl a year or so after my grandmother passed. Some of my aunts and uncles even went to go visit her back home.
Story credit: Reddit / tiffysner