Ann-Beth (Horwitz) Ostroff, 74, of East Falmouth, Mass., died Sept. 29. She was the widow of Morris Ostroff. She was the daughter of Myron Horwitz and Selma Mukjian (Horwitz) of Boston. She is survived by her children, Myles Ostroff and his wife Meghan Moore Ostroff of Falmouth, Mass., and Jana Backus of Windsor; her grandchildren, Cameron Backus and his wife Tierney, Mason Backus, Ella Ostroff, and Leo Ostroff; her great-grandchildren, Erikson, Beauregard, and Wesley Backus; and her sister-in-law Marti Horwitz. She was also predeceased by her brother Harvey S. Horwitz.