Thomas learned he's the father on The Bold and the Beautiful.
For months, fans watched as Caroline and Ridge tried to keep the truth about Douglas' paternity from Thomas. They may have kept their dark secret, too, if it weren't for Ridge's urologist spilling the news to Katie right before he was killed by a truck.
After much prodding, Katie convinced Ridge and Caroline to tell Thomas that he's truly the father of the baby he long believed was his little brother. Now that he knows, everything could change.
Watch The Bold and the Beautiful on CBS.