My father has a cousin whom my sister calls "uncle"; is it permissible for this man to marry my sister in this manner, (Part No. 18; Page No. 380) bearing in mind that the daughter calls him "uncle"?
If the said person is not a paternal uncle to the girl either through lineage or breastfeeding, he will be permitted to marry her, and her calling him "uncle" has nothing to do with invalidating marriage. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.