First of all, speak with everyone in your family....ask questions and write down what they say or think is correct.This may give you some valuable clues. What is it you want to know?If this is merely your way of saying you wish to start doing research into your whole family, then you need to do some reading...do a few google searches with 'beginning family genealogy', etc as your subject, and read up on how to get started.There are lots of books published on the subject, so go to your local library and see what they have. Dates are important....surely you, or someone in the family knows when your grandfather died...and where.....you need to obtain a death certificate for him - it may well have his place of birth, parents' names and their place of birth.All vital records such as these are found in different places in different counties in different states, so your job is to find out, by surfing the net, where they are warehoused in the county you're interested in. Newspaper obituaries usually have valuable information, so see what is available for the place where your grandfather died. This should get you started. (I looked on the Social SEcurity death index, but found no Paul Doughty who was from Nebraska..perhaps he lived elsewhere?