Gavin & Stacey's Alison Steadman broke down in tears when she found out her father had been adopted on ITV's DNA Journey.
The much-loved actress, 76, who plays Pam Shipman in the BBC sitcom, went on the show with her co-star Larry Lamb, 75.
The star was heartbroken to learn her grandmother wasn't biologically related to her and was left reeling from the life-changing news.