Ayesha reported,

She reported that Aflah, the brother of Abu al-Quays, came seeking permission to enter her home, as he was her uncle through breastfeeding, after the verse of the veil had been revealed.She said, "I refused to grant him permission to come in to me. When the Messenger of Allah ﷺ arrived, I told him what I had done, and he ordered me to allow him to enter."

Azami 6688

Sahih

عن عائشة أم المؤمنين

أنها أخبرت أن أفلح أخا أبي القعيس جاء يستأذن عليها- وهو عمها من الرضاعة- بعد أن أنزل الحجاب، قالت: فأبيت أن آذن له علي، فلما جاء رسول الله ﷺ أخبرته بالذي صنعت، فأمرني أن آذن له علي.

الأعظمي 6688صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Breastfeeding
Section
Milk kinship through the husband
Numbering
Jami al-Kamil 6688 (2nd edition)
Azami 6688