1. Lisa Bonet in her early 30s: Time & Life Pictures / The LIFE Picture Collection via Getty Images
Her daughter, Zoë Kravitz, in her early 30s: Cindy Ord / Getty Images for Tiffany & Co.
2. Eugene Levy in his late 30s: Donaldson Collection / Getty Images
His son, Dan Levy, in his late 30s: Bruce Glikas / Bruce Glikas / WireImage
3. Cindy Crawford at about age 20: Time Life Pictures / The LIFE Picture Collection / Via Getty Images
Her daughter, Kaia Gerber, at about 20: Miguel Medina / Getty Images
4. Gwyneth Paltrow at approximately 19: Nbc / NBCUniversal via Getty Images
Her daughter, Apple Martin, at approximately 19: Pascal Le Segretain / Getty Images
And here's Chris Martin, Apple's father, in his early 20s: Brian Rasic / Getty Images
5. Denzel Washington at about 35: Nancy R. Schiff / Getty Images
His son, John David Washington, at about 35: Jon Kopaloff / Getty Images
And here's his mother, Pauletta Washington, at about 35, too: 6. Dennis Quaid in his early 30s: Ron Galella / Ron Galella Collection via Getty Images
His son, Jack Quaid, in his early 30s: Angela Weiss / AFP via Getty Images
And here's Jack's mother, Meg Ryan, in her early 30s: Mychele Daniau / AFP via Getty Images
7. Julio Iglesias when he was about 40: Harry Langdon / Getty Images
His son, Enrique Iglesias, when he was around 40: Kevin Winter / WireImage / Getty Images
8. Diana Ross when she was about 20: Michael Ochs Archives / Getty Images
Her daughter, Tracee Ellis Ross, when she was about 20: New York Daily News / NY Daily News via Getty Images
9. Cuba Gooding Jr. at about 26: Ron Davis / Getty Images
His son, Mason Gooding, at about 26: Pascal Le Segretain / Getty Images for Loewe
10. David Beckham when he was about 21: Fiona Hanson - Pa Images / Getty Images
His son, Brooklyn Beckham, at about 21: David M. Benett / Getty Images
11. Carrie Fisher in her late 20s: Paul Harris / Getty Images
Her daughter, Billie Lourd, in her late 20s: Mike Marsland / Mike Marsland / WireImage / Getty Images
And here's Billie's father, Bryan Lourd, at about 30: Ron Galella, Ltd. / Ron Galella Collection via Getty Images
12. Kathy Hilton when she was in her mid-20s: Ron Galella / Ron Galella Collection via Getty Images
Her daughter, Paris Hilton, in her mid-20s: John Shearer / WireImage / Getty Images
13. Goldie Hawn at about 19: Joseph Klipple / Getty Images
Her daughter, Kate Hudson, at about 19: Albert L. Ortega / WireImage / Getty Images
14. Tom Hanks in his mid-20s: Abc Photo Archives / Disney General Entertainment Content via Getty Images
His son, Colin Hanks, in his mid-20s: Barry King / WireImage / Getty Images
15. Uma Thurman when she was about 24: Kurt Krieger - Corbis / Corbis via Getty Images
Her daughter, Maya Hawke, at about 24: Daniele Venturelli / WireImage / Getty Images
And here's her father, Ethan Hawke, at about 24: Steve Eichner / WireImage / Getty Images
16. Meryl Streep in her early 30s: Bachrach / Getty Images
Her daughter, Grace Gummer, in her early 30s: Michael Loccisano / Getty Images
17. Melanie Griffith in her early 20s: Abc Photo Archives / Walt Disney Television via Getty
Her daughter, Dakota Johnson, in her early 20s: Kevin Winter / Getty Images
18. Will Smith in his early 20s: Nbc / Getty Images
His son, Jaden Smith, in his early 20s: Rich Fury / Getty Images
19. Jada Pinkett Smith in her early 20s: Eric Robert / Getty Images
Her daughter, Willow Smith, in her early 20s: Jerritt Clark / Getty Images
20. Demi Moore in her early 20s: Ron Galella / Ron Galella Collection via Getty Images
Her daughter, Scout Willis, in her early 20s: Stefanie Keenan / Getty Images
And this is the earliest pic I could find of her father, Bruce Willis: I believe he's in his early 30s here.
Abc Photo Archives / Disney General Entertainment Content via Getty Images 21. Reese Witherspoon in her early 20s: Steve Granitz / WireImage / Getty Images
Her daughter, Ava Phillippe, in her early 20s: 22. Ryan Phillippe when he was about 18: Steve Fenn / Disney General Entertainment Content via Getty Images
His son, Deacon Phillippe, when he was about 18: Jon Kopaloff / Getty Images,
23. Kurt Russell when he was in his late-20s: Donaldson Collection / Getty Images
His son, Wyatt Russell, when he was in his late 20s: Gregg Deguire / WireImage / Getty Images
24. Leslie Mann in her mid-20s: Sam Levi / WireImage / Getty Images
Her daughter, Maude Apatow, in her mid-20s: David M. Benett / Alan Chapman/Dave Benett/Getty Images
And here's the earliest picture I could find of her father, Judd Apatow: I believe he's in his early 30s here.
Nbc / NBCU Photo Bank / NBCUniversal via Getty Images 25. And lastly, Nick Clooney in his early 20s: Bettmann / Bettmann Archive
And his son, George Clooney, in his early 20s: Nbc / NBCUniversal via Getty Images
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