Mufti’s cousin
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Shabtai Teveth, “Ben-Gurion and the Palestinian Arabs: From Peace to War”, (Oxford University Press, 1985), p.156.
Jamal al-Husseini, brother-in-law of Musa Alami, was the Mufti’s cousin, and was also one of the more radical supporters of the Mufti’s violent tactics, Like the Mufti, he too saw Nazi Germany as a natural ally in the struggle against the Jews and did not conceal his admiration for Hitler.
https://books.google.com/books?id=J3aEAAAAIAAJ&focus=searchwithinvolume&q=%22Cousin%22