He states that he was personally acquainted with Shoghi Effendi and was aware of the weaknesses of ‘Abdu’l-Bahá’s family members,. He specifically recounts an incident involving Shoghi Effendi and Dr. Zia Baghdadi. Sobhi describes a time when they were together making jokes typical of young men. He claims that after briefly leaving the room and returning, he witnessed them drinking wine. When Sobhi questioned Dr. Baghdadi about what they were doing, he reports that Shoghi Effendi turned to him and said, "If you want some too, come and drink".
(The Memoirs of Fadlullah Mohtadi Sobhi)
https://archive.org/details/payam-i-pedar-sobhi/payam%20i%20pedar%20sobhi/