Parent/child - longest link?

I was idly wondering what the longest link in the tree is between a parent and child. So far the longest I can come up with is a mere 7 steps:

Bob Dylan to Jakob Dylan
Michael Nesmith to Jason Nesmith

Can anyone do better?

I can do worse.

Charlie Haden to Petra (4), Rachel (5), or Josh (5).
John Bonham to Jason Bonham (3).
Yoko Ono to Sean Lennon (1).
Ringo Starr to Zak Starkey (0).

Hans and Candy Dulfer also 0 steps (not live yet though)

Steve Groves to Caley Groves: currently 12 steps, will be 0 when Duck Musique gets in the db.

Arlo Guthrie is in, Woody Guthrie will be in when the Almanac Singers are made live. They'll have a distance of 1 through Pete Seeger.