The star had daughter Vanessa with her first husband Roger Vadim in 1968, and a son, Troy, with activist Tom Hayden five years later.
But Fonda admits she was an absent mum for most of their young lives – because she was too focused on her anti-Vietnam War efforts.
She says, “I don’t think I taught them much. I don’t think I was that good of a mother. But I did always tell them the truth and I hope they can always learn from my mistakes.
“I was just moving from Barbarella into an anti-war activist when my daughter was born and I was out there on the barricades and I should have brought her with me but I didn’t. I wasn’t around a lot.”
And now that her children have kids of their own, she’s making a big effort to be a part of their lives.
She adds, “That’s what’s so great about being a grandmother – it gives you a second chance.”