Barry Crocker, a legendary Australian singer, television performer and actor,  appears to be the only showbiz celebrity in the family.  Barry (b.1935) is a grandson of  Mary Keenan, one of Henry and Nancy Keenan's 11 children.  

Mary Keenan married John (Jock) Houston.  This is what Barry had to say about the couple:

Parts of Barry's book are published on Google Books,  http://books.google.com.au.

Barry has his own website, which you can visit by clicking HERE.

Barry's excellent comic  rendition of  "Stairway to Heaven" (with the Doug Anthony Allstars) can be viewed

 at this You Tube location.

The photographs below are a sample of the dozens on Barry's  site.

Barry Crocker with Smokey Dawson (2006)

Barry Crocker with Joan Rivers (2006)

Barry as Barry MacKenzie