Phillip Underwood and Michelle Sheridan and their children, Logan and Lilliana, gather in their living room in Frederick, Md., after a long day of work and school. The couple had delayed marriage, in part for financial reasons. James Clark/NPR hide caption

itoggle caption James Clark/NPR

Having a special someone won't fend off depression if that person doesn't have your back. iStockphoto.com hide caption

itoggle caption iStockphoto.com