Finally got DH to look at a box of old papers he brought back from his parent's house. There are old documents (1910-1933) within showing that his grandfather invested in oil wells and and land lots in various places. We have no idea if any of these are worthwhile to chase down or even how to start. I am tempted just to put it all in an envelope and hand off to one of his siblings. Chances are they are worthless, right?