What is family? An obvious answer is the one we were born into, but don’t always keep close, as we age. Sometimes family is the company you keep, which for much of the past 10 years has been the company I helped start. And then there’s the family you start. All three collided this year. Upon learning about the coming arrival of our first child, I left one work family and joined a new one. Upon his birth, my mother stayed with us for a month, which is the longest we’ve spent together in a long...