Question: What was a branch of the Khalwatiyya order of Islamic mysticism founded by Sayyid Hasan Husameddin, with relations to the cousin and son-in-law of Muhammad?
Sentence (from "Ali"): Ali ( ; Arabic: علي‎ , "ʿAlī " ‎ , ] ; 13 Rajab, 21 BH – 21 Ramadan, 40 AH (c. 594 – 29 January 661) was the cousin and son-in-law of Muhammad, the prophet of Islam.
Relevant evidence: Yes