I can think of a few families in which members of three generations are renowned in the same field:
Auto racing:
Mario > Michael > Marco Andretti
Lee > Richard > Kyle Petty
(I’m sure there are more, but I’m not a big NASCAR fan.)
Writing:
Robert > Nathaniel > Peter Benchley
(Nathaniel is best known for writing the book on which The Russians are Coming! The Russians are Coming! is based.)
Painting:
N.C. > Andrew > Jamie Wyeth
Acting:
Henry > Peter > Bridget Fonda
John > John Drew > Drew Barrymore
(I’d never heard of Drew’s dad before starting this thread.)
The only case I know of with more than three generations is also in acting:
Roy Redgrave > Michael Redgrave > Vanessa Redgrave > Joely Richardson
(I also hadn’t heard of Roy before looking up Michael on IMDB. He did a few silents back in the second decade of the 20th century, but he’s not exactly a household name.)
Do you know of any others? I suspect 3-gens are relatively common, so while I’m mildly interested in hearing about more of them, I’d be much more impressed by 4-gens or more.
My criteria:
Four or more generations in direct descent: no skipping generations or lateral jumps to cousins or nieces/nephews.
All reasonably well known: A string of five lawyers, doctors, ministers, or military officers that no one has ever heard of, or of whom only one or two have have risen to celebrity status, are not allowed.
All known for accomplishments in the same field.
Of course, if you think you have an interesting case that doesn’t quite meet my criteria, I won’t be too rigid about it.