As my two boys got older, they developed this amazing sixth sense about when to disappear. They could anticipate when my SUV would pull up the long driveway stocked with food and household supplies, and suddenly they were nowhere to be found. Getting groceries from the car into the kitchen begins with 2 flights of stairs. Sometimes putting items away means 2 flights up, then 2 flights down, then 2 flights back up. I used to get so frustrated. It was physically taxing, tedious work and foot travel between the car and the kitchen. And even when my boys grew up and moved out, I’d keep finding myself in that…