Hunter Biden is speaking out about his relationship with his brother’s widow, Hallie Biden. The two began dating after Beau Biden died of brain cancer in 2015. “Both of us had gone through the most incredibly painful loss, and it was out of love, and I thought maybe that love would bring my brother back. And it didn’t work,” Hunter said in an interview on “CBS This Morning.” Relationship expert Dr. Wendy Walsh says affairs between brothers and sisters-in-law happen more often than you'd think. #InsideEdition