Hello Terry,
I'll certainly do what I can because I know exactly how you feel. My gt-Grandad's circumstances are exactly the same, born out of wedlock and raised by his grandparents, but you are fortunate enough to know who the mother was. I have a good idea who mine was but cannot find any solid evidence as she seems to have disappeared after that.
One thing that I have decided on with my gt-Grandad is that he was raised by the Cruddace family and I don't really care who his biological father was as he had nothing at all to do with his upbringing and education, or the shaping of his character, so he was 100% a Cruddace in my view. I'm pleased to say that he did quite well for himself.
Regards,
Colin