Anagram - Interesting - I was not aware that members didn't need to be grandparents, but It makes sense as I'm sure there are some who act in the roll of grandparent, without actually being one.
We have had a few Granddads join from time to time, but they have left after a short while. For some reason male oriented subjects do not seem to take off, and if we join in some of the female orientated ones, we go away nursing the bruises. 
I am happy to stand toe to toe in any discussion, provided it doesn't get personal. I heal quickly !.