It was narrated from ‘Aishah that her paternal uncle through breast-feeding, whose name was Aflah, asked permission to meet her, and she observed Hijab before him. The Messenger of Allah صلی اللہ علیہ وآلہ وسلم was told about that and he said: “Do not observe Hijab before him, for what becomes unlawful (for marriage) through breast-feeding is that which become unlawful through lineage.” (Sahih)