Even though the recession officially ended seven years ago, a housing trend seen during the downturn has endured: The number of multigenerational homes continues to grow. A record 60.6 million people, or 19 percent of the American population, lived with multiple generations under one roof in 2014, according to a new Pew Research Center analysis of federal census data. That compares with 17 percent in 2009, the year the recession ended, and 18...