Who is represented in the well-known picture "American Gothic Style"?

Probably, all know the picture "American Gothic Style". It in each encyclopedia of art, regularly flashes in social networks, there are tens of thousands of parodies to it. And, many are convinced, as if represented the farmer with the wife, to Wood Grant. Who are they and who characters from a canvas – if not spouses? Source: yaustal.com 1942. Nan Wood Grant Graham and Byron Makkibi. For a start it is a little about the well-known work Wood Grant. The picture was written in 1930. The name "American Gothic Style" is sending to architectural style. So-called "the carpenter's gothic style" became very popular in...