> U.S family size hit an all-time low (3.13) in 2003 Do you have a reference for this? Would love to see what the metric is based on (e.g. does it assume two p

> U.S family size hit an all-time low (3.13) in 2003 Do you have a reference for this? Would love to see what the metric is based on (e.g. does it assume two parents, meaning 1.13 children).