"Kilicdaroglu then listed offshore bank transfers totaling $15 million, which he claimed were made by Erdogan's inner political circle and family, including one of the president's sons and a brother. All alleged payments were made to an account on the Isle of Man, a British Crown dependency in the Irish Sea renowned for offshore banking."
https://www.voanews.com/a/turkey-opposition-claims-recep-tayyip-erdogan-family-hid-money-offshore/4140478.html