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Answers: years and one was diffrernt for the first couple of episodes?

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Brad, Randy and Mark.

They were played by the same three actors the whole run, but Jonathan Taylor Thomas (Randy) left before the series ended. I think they explained he went off to college.

The youngest kid (Mark) looked different in the early episodes. As he grew up, he turned "goth" -- or at least very serious. But it was the same actor.

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It was the same 3 sons from the very beginning...Brad, Randy, & Mark. Johnathan Taylor Thomas, who played Randy, left the show in the 8th season to concentrate on his academics.

Oops, the first person only had the 3 names at first, that's why I added a little more. Looks like they had the same idea.

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Brad(Zachary Ty Bryan) Randy(Johnathon Taylor Thomas) and Mark (Taran Noah Smith) they were always the same actors but Randy left..

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Randy, Mark & Brad

played by Zachary Ty Bryan (Brad) Jonathan Taylor Thomas (Randy) & Taran Noah Smith (Mark)

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