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paternal uncles and maternal uncles. They are mahrams by blood even though they are not mentioned in the aayah, because they are like parents and are regarded by people as having the same status as parents, and a paternal uncle may be called a father. Allaah says (interpretation of the meaning):

“Or were you witnesses when death approached Ya‘qoob (Jacob)? When he said unto his sons, “What will you worship after me?” They said, “We shall worship your Ilaah (God — Allaah) the Ilaah (God) of your fathers, Ibraaheem (Abraham), Ismaa’eel (Ishmael), Ishaaq (Isaac)…” [al-Baqarah 2:133]. Ismaa’eel was the paternal uncle of the sons of Ya’qoob.

ref:
(Tafseer al-Raazi, 23/206; Tafseer al-Qurtubi, 12/232, 233; Tafseer al-Aaloosi, 18/143; Fath al-Bayaan fi Maqaasid al-Qur’aan by Siddeeq Hasan Khaan, 6/352)

Shaykh Ibn ‘Uthaymeen said:
Note that a person’s maternal or paternal aunt is a maternal or paternal aunt for him and for all those who are descended from him. So your father’s paternal aunt is a paternal aunt for you, and your father’s maternal aunt is a maternal aunt for you; your mother’s paternal aunt is a paternal aunt for you and your mother’s maternal aunt is a maternal aunt for you...