My mom's mother made peanut butter cake way back when. I don't have the recipe, personally, but I did some quick Google searches and [url=http://thepioneerwoman.com/cooking/2013/11/peanut-butter-cake-with-chocolate-icing/]this[/url] recipe sounds pretty close to what I remember my mom telling me previous times. She just passed away, so I can't ask her or anything, though, sorry. Either way, I'm not sure if this is close to what HIS family used and granted that it is another online recipe, but it's worth a shot to throw it at you.