"the only fly in the ointment was my mother in law" in German The only fly in the ointment was my mother-in-law. Das einzig Störende war meine Schwiegermutter. Detailed translations for "the only fly in the ointment was my mother in law" The only fly in the ointment was my mother-in-law. The only fly in the ointment was my mother-in-law. Das einzig Störende war meine Schwiegermutter.