Marrying the daughter of the paternal cousin

Q: Two brothers and their children live in one house; the children have been raised and married in the same house, even though there was no breastfeeding that makes them Mahrams (unmarriageable relatives). My questions are: (Part No. 18; Page No. 348) 1. Is it permissible for one brother’s children to marry the other brother’s children?2. Is it permissible for the sons of the one brother to marry the granddaughters of the other? Are the sons regarded as uncles of the granddaughters, as the granddaughters greet them claiming that they are in the status of their uncles because they all live in the same house?I hope that you will answer me and help overcome these worries. As-salamu ‘alaykum (May Allah’s Peace be upon you)

A: If the reality is as you have mentioned, it is permissible for the sons of one brother to marry the granddaughters of the other brother. As for them greeting each other, this is ignorance and error. It is not lawful for daughters to uncover their veil in front of their paternal cousins, shake hands with them, or be in Khulwah (being alone with a member of the opposite sex) with them, as they are not Mahrams to them. May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family, and Companions.