Parents to triplets, Amy and Nick Bancroft had a vision for a modern house with areas for learning, therapy, sleep, and play, as well as common spaces for family time, a retreat for their 10-year-old son, and a private refuge where the couple could relax and refuel. A piece by John Belingheri hangs in the living room of the Bancroft family’s home, which is centered by an Antonio Citterio sofa and Robert Marinelli tables.