In our single years, we trekked across the world unrestrained. We didn’t hold sleeping babies until our arms cramped up. We didn’t weather a toddler’s tantrum while one of us was pulled aside by the TSA for inspection. People didn’t glance at us getting on the plane trying to hide their fear that our seats would be close by. We didn’t fill our pockets with Juicy Fruit gum, or collapse a stroller at the gate.