If you don't mind my asking, what was your grand dad's name and do you know his spouse's name (first and or last) and what was your dad's name, date of birth and location of either?Date of marriage or death (even approximate helps) or location?
Any additional information sometimes helps in searching backwards.
That's what I had been doing with your data.
Your grand dad's marriage certificate, death cert, birth cert, or even census data can help fill in the blank spaces if they can be located on a search.
For example:Say your dadwas born in in 1910 in OH, he might be in the 1920 census with his parents and siblings.Some census data contain place of birth, by state and or city and state for each person in a family, and or Year or Month/Year of birth.
Then you get the parents names.By the childrens ages, you can get an approx date and location of a marriage.Then you search that timeframe and location for possible matches.
If you want to keep any of that information private, I would certainly understand.But anything that you can add would help.Even sometimes initials like his name was JD McLaughlin b. in OH in the 1890's can lead to new sources.