The grandson of the grandmother's sister as non-Mahram

Q: I wear the face veil in the presence of all the people who have no right to look at my face. However, I do not wear it in the presence of the grandson of my grandmother's sister, whom I regard as my brother, as I do not have a full brother. I only have a half brother who does not care about me or ask about my affairs related to this world or the Hereafter. He just asks about how my health is and that is all. Thethe grandson of my grandmother's sister is a respectable man and he is a married man. He obeys Allah and advises people to do what is good in this world and in the Hereafter. He always gives me advice and sends me religious books and encourages me to obey Allah (Exalted be He) and His Messenger. I regard him like a brother as he guides me to what is right if I make a mistake. He is sixty years old now. I wear the face veil in the presence of his brother but not in his presence. Am I committing a sin by doing so or not? It should be noted that I fear that if I wear the face veil in his presence, he may think that I am ungrateful because it was he who guided me to wear the face veil and not to expose my charms. He also guided me to wear the gloves and socks. He used to send me this advice from Jeddah through anyone coming to our village. I hope your Eminence will guide me in doing what is right and what pleases Allah (Exalted be He). May the Peace, Mercy and Blessings of Allah be with you.

A: You have to cover your face in the presence of the grandson of my grandmother's sister. (Part No. 17; Page No. 391) In fact, he is the son of the daughter of your father's maternal cousin and not a Mahram (spouse or permanently unmarriageable relative) to you. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.