David Rossi found out he has a daughter—and a grandson.
When Rossi was approached by a young woman named Joy Struthers, she told him she is his daughter from one of his previous marriages. At first, Rossi didn't believe her, but he later realized that this was his chance to finally have a family.
Rossi chased after her and caught her at the airport just before her flight out, only to find that he not only has a daughter, but also a son-in-law and a grandson. The two embraced before embarking on the plane to both meet her family and begin cultivating a relationship together.
Season 10, Episode 9 "Fate"