Career
He became infamous for debasing the currency on behalf of Frederick the Great in order to finance the Seven Years" War. He had three sons: Joseph Ephraim (1730-1786), Edel Ephraim (1728-1750) and Zacharias Ephraim (1736-1779). Zacharias married Rosine Samson who died in 1803.
Their daughter Rosette Ephraim married Heimann Fraenkel (1748-1824) who was Elke"s grandson.
References: Forgotten Fragments of the History of an Old Jewish Family by Louis and Henry Fraenkel.