About 4 years ago I bought a basket case 28 roadster from the son of a man who had passed away several years before. He gave me a bill of sale. I'm concerned that the estranged wife of the dead guy, (the son said he didn't know where she is), may be the legal owner of my roadster. Is there some way I can research this, using the frame number, without making waves, and possibly loosing my roadster?