In a speech on Tuesday, President Joe Biden urged Americans to get vaccinated and get their booster shots during the holidays. Meanwhile, families are figuring out how to gather with unvaccinated relatives and loved ones, some of whom are hesitant, and some of whom are just downright resistant to getting vaccinated. Marco Werman interviews Vish Vishwanath, a professor of Health Communication in the Department of Social and Behavioral Sciences at the Harvard T.H. Chan School of Public Health, who studies how families can communicate productively about vaccines.