The Bell family home was in Cambridge, Massachusetts, until 1880 when Bell's father-in-law bought a house in Washington, D.C., and later in 1882 bought a home in the same city for Bell's family, so that they could be with him while he attended to the numerous court cases involving patent disputes.

Answer this question, if possible (if impossible, reply "unanswerable"): Where did Bell and Mabel live before 1880?
Cambridge, Massachusetts