The two versions of the "house that built Jack" spot feature a young boy talking about his parents moving into their own home, so they can start a family.
The one-minute films are aimed at both English and Scottish audiences, one featuring the Murston family, and the other, the McAvett family, and will run until mid-July.
The spots show Jack describing how his parents used to live with grandma and granddad, with cutaways to awkward moments on the sofa, before they saved up enough money to buy a home of their own – and have him.
M&C Saatchi’s group executive creative director Elspeth Lynn worked on the ad, with copywriter David Fleetwood, art director Gary Monaghan, planner Sabrina Douglas and photographer Paul O’Connor.
Pete Riski directed the films, which appear on TV and YouTube, and the production company is Rattling Stick.