Thanks for the reply

Sometimes dealing with past problems needs a slightly different approach
I decided, to deal with it a different way…as it was way to late to beat the crap out of him and I didn’t want to be the new bully
When my son was born 20yrs ago. My grandmother ( from my mums side and my mum had already died from cancer 13 yrs before that) died. I went to the funeral with my 8month old son.
I hadn’t seen or spoken to him in all that time, probably 12yrs !,. Now I know my sisters had probably told him about my son
Anyhow at the funeral he was very keen to meet his “so-called grandson” . He said is this the grandson I’m missing out on”. I just agreed with him. I didn’t hang around, as I was only there for my grandmother .And he’s never seen him since.
That’s why my son knows the bully he was, because as with all children they ask questions. So I was honest with my son. But I never said what actually happened over the yrs, just that he beat me and stuff ( never said about the waterboarding twice when I was a bout 14 hat I remembered many yrs later.)
I 'm over it now because I’ve walked away many yrs ago

it’s just a story to me.
Anyhow that said, it’s up to my son if he wants to meet his step grandfather