This is actually 2 short stories by the author Murray Bail, Camouflage and The Seduction Of My Sister, published in 2000.

Camouflage tells the tale of an unassuming piano tuner from Adelaide who is sent north to do his bit during WW2, while The Seduction Of My Sister takes the reader on a journey of odd twists and turns when a new family moves into an average suburban street.