One daughter from Demmer's marriage with Sophie Ernst was the actress and singer Jeanette (actually Johanna) Ziegler née Demmer (1800 in Aachen - 2 July 1878 in Pest), who as Jeanette Demmer or married Jeannette Schmidt-Demmer was a member of the Vienna Court Opera from 1808 to about 1815 and then worked at the Theater in der Josefstadt.