Sahih Bukhari

Narrated Aisha:Aflah asked the permission to visit me but I did not allow him. He said, ""Do you veil yourself before me although I am your uncle?"" `Aisha said, ""How is that?"" Aflah replied, ""You were suckled by my brother's wife with my brother's milk."" I asked Allah's Messenger (ﷺ) about it, and he said, ""Aflah is right, so permit him to visit you