Gee, I don't like to be uncharitable on this Holiday, but I think I figured it out. Big capitol G isn't Dad to a Grom: that would be Grom'sDad. And it's not the father of several Groms: that would Groms'Dad. Nope, it GromsDad.
This suggests a relationship to young boys that one might find in the Personals ads. As in, 'Who's your Daddy', or maybe, 'Young men and boys interested in a unique father/son relationship respond with photos and contact info..'
Is that big G a hidden reference to your G spot? Located near your tonsils? Just curious. It does seem that your posts are typed one handed, with the other hand busy in your pants.