It's not always kids who wind up reeling when they discover the people they believed to be their parents aren't actually their parents -- biologically speaking. TV dads often get blindsided with parentage reveals too.
In some instances, characters find out they're the father. Other times, a TV dad discovers his child(ren) aren't biologically his after all. Most of the time it's because their partner had an affair. However, time travel and other sci-fi wackiness have been known to cause unexpected parentage twists too.
Some of the dads below never found out. Others couldn't get past the shock and distance themselves from the child. Finally, there are those who said they're the father no matter if DNA says otherwise.
1. Blake Carrington - Dynasty (2017)
Blake didn't take the news of Ander's being Steven's biological father very well. Anders bore the brunt of Blake's wrath, but they made peace. With Steven, in one of Blake's better moments, Blake insisted nothing between the two would change.
2. Darnell Turner - My Name is Earl
At the time Earl Jr. was born, Joy and Earl were married, but Joy was having an affair with Darnell. Everyone assumed Darnell was Earl Jr.'s father. Then in what turned out to be the series finale, everyone found out Darnell wasn't the biological father after all. The identity of the who it was remains an unsolved TV mystery.
3. Wyatt Logan - Timeless
In the original timeline, Wyatt's wife Jessica was murdered. A few time travel shenanigans later and Jessica was no longer dead. Then she told Wyatt they were going to have a baby. Only she was lying to him because she was a Rittenhouse agent.
4. Ethan Hart - Hart of Dixie
When Zoe was 10, she was injured badly enough to make doctors think a blood transfusion, which led to Ethan finding out Zoe was the product of his wife's affair. Ethan couldn't get past it. He divorced his wife and estranged himself from Zoe. As for Zoe, she spent years not understanding why things were different between them.
5. Noah Solloway - The Affair
Devastated with how Noah portrayed her in his book, Alison briefly sought solace with Cole and then spent weeks separated from Noah. When Alison and Noah reunited, she announced she was pregnant. Initially, they raised baby Joanie together, but DNA testing confirmed Cole was the father.
6. Dan Humphrey - Gossip Girl
A paternity test confirmed Rufus and Lily's suspicions -- Dan wasn't baby Milo's father. Georgina said he was to get wife of Milo's father off her back. Once the situation cooled and she made up with her parents -- Georgina took Milo and left. Despite the lie, Dan was devastated.