Isabel Mary Petre (born 1895) (b. 1895) Parents Margaret Cargill Francis Petre Children Margaret Ellen O'Beirne Cecil Hugh O'Beirne Joseph Francis O'Beirne Siblings Rosamund Margaret Petre Constance Mary Petre Edward Henry Petre Margaret Elizabeth Mary Petre Henry William Petre Agnes Dorothy Mary Petre William Robert Joseph Petre Gertrude Mary Petre Monica Helen Mary Petre Bernard Francis Petre Philip Lewis Petre Joseph Austin Petre Partners Hubert V. O'Beirne