It makes a certain amount of demographic sense. People move away from home well before they're married. They change jobs, they get married later and divorced more frequently. Many of us, for some part of our lives, will be relying not on our families of origin and not on the families we form with partners or long relationships with people we work with, but on one of these assembled collections of people picked up along the way. Not a birth family or a married family or a fortuitous work-based family, but a collected and curated family.