I know it is a few years since you posted this message on roots web but I think we are related. I think that you great grandfater is my great uncle. I don't know if you got anything from this query but if this is correct Valentine would have been my grand mother's brother and he died in 1946.
Would you be the son of either Edward or Eric? I have a family tree done up in about 1980 when a sister (Katherine M. Stevenson nee Guinan) died and her inheritance was being shared.
John Guinan died in 1960 according to records that I have.