 Alexander Fetter was married to Jean Fetter (who is now married to Steven Chu, Alexander's former colleague and a former Secretary of Energy under President Obama) and had 2 children with her (Anne L. Fetter, and Andrew J. Fetter), and is currently married to Lynn Bunim.His beloved sister Ann ("Nan") Fetter Friedlaender was the first woman Dean at MIT (Economics Department).Sandy Fetter has 6 grandchildren the first of whom was born in 1995 and the most recent in 2007.