I've thought more about it--and sneeked a couple of peeks into a search engine.
Here are a few more:
Jane Mansfield's daughter, Mariska Hargitay
Kate Hudson...daughter of Goldie Hawn
Emilio D. Estevez and Charlie Sheen, sons of Martin Sheen
...and...and...and...
Drew Barrymore
Jamie Lee Curtis
Sean and Chris Penn
Rosanna Arquette --and David and Patricia
Michael Douglas
Isabella Rosellini
Laura Dern
Jeff and Beau Bridges
Sean Astin
George Clooney
Peter and Jane Fonda
Nick Cassavetes
Liza Minelli
Adam Arkin
Geraldine Chaplin
Mira Sorvino
Melanie Griffith
Robert Downey, Jr.
And Angelica Houston is the daughter of John Houston who was the son of Walter Houston (the only case of three generations winning an Oscar)