Scott Bakula to play MacLaine's son
Christopher plays a widower whose love of life is reinvigorated after he makes friends with his colourful neighbour, played by Shirley.
Quantum Leap star Scott will play Shirley's banker son, Variety reported.
The Postman's Michael Radford will direct the indie film.
Scott recently finished filming the thriller Snap, which also stars Twilight actress Nikki Reed.