Wilbert Gore invented Gore-Tex. He wrote a complicated will which, basically, divvied up his money equally amongst his grandchildren via a trust which gave his five children an income. He died in 1986. One of the children had an idea.
Susan W. Gore, one of Wilbert's five children, triggered a five-year Delaware Chancery Court battle by adopting her ex-husband. The event that adoption experts call incredibly rare and perhaps unprecedented -- a man becoming his former wife's son -- occurred in 2003 in Wyoming, where the Gore family has roots.
There's more here and here. It's all very Bleak House. This is Susan Gore.