Ah, how did I miss that!
I found similar on Reddit. Two of those six children were step children, apparently.
Guy Pierce might be more interesting than the surviving GB members. He had two children with his first wife, then they divorced in early 1976. Coincidence, right after the 1975 debacle? He the married his second wife Penny, who also had two children. Then they had two children together. His widow Penny was interviewed at last year's convention. The unusual thing about Guy is that he has grandchildren. One of them shared some interesting information on Cedars' blog, indicating he was a pretty normal grandpa. But he does look a bit like Herman Munster to me.
He looked like Grampa Munster (uncanny!) not Herman Munster.
Does anybody have more information on any of the other GB members, even if just to rule out that they had children?