Usha Vance and Vice President J.D. Vance have announced their fourth child, becoming the first vice presidential family to have a child while in office since 1870. The couple, who have three children under the age of 9, felt 'complete' with their third child and decided to add a fourth to their growing family. In an exclusive NBC News interview, Vance shared how this pregnancy is going well and how her role as an advisor to the vice president is different than her previous ones.