Yeah, but let's face it. Growing up in a house where both of your parents were actors might leave you predisposed to going that route anyway.

>She encouraged each of her children to "pretend" for an hour each day.[2] Her son, Jeff Bridges, later said that the playtime "pretend" games were "basically the basis of acting."

The difference here being that back then people would say things like "it runs in the family" while referring to the talent but by the same token nobody that I can think of tried to claim that their becoming famous had absolutely nothing to do with who they were related to.

It was openly acknowledged that being raised in the culture by people who were already famous gave you a leg up and noone was really trying to pretend otherwise.

I can't imagine everyone was rushing to train total n00bs on the ins and outs of Hollywood society and the finer points of filming for the big screen vs. performing on a theater stage when they had a whole crop of kids who had been around it since they were in diapers.

>Jeff Bridges notes that both his parents studied under Michael Chekhov and that "and a lot of things my mom learned with him were passed down to all of us."

They came pre-conditioned.