Question
Is the father's brother a mahram to the wife and daughter? Is it permissible to greet him and uncover the head in front of him?
Answer
I say, and with God's help: The father's uncle and his paternal uncle are forbidden to his daughters, granddaughters, and daughters of his sons, and it is permissible to greet them and uncover hair in front of them; because they are from the first degree of grandchildren, so their prohibition is permanent. Unlike the wife, they are not forbidden to her, and it is not permissible for her to greet them or uncover her hair in front of them. And God knows best.