That's a good question... we haven't quite figured out who all of Bill's children are to know specifically. But, we do know that my great-uncle is Scott Henderson Lilly, and my grandma confirmed the Henderson part was a family name. From other pieces of information we have found, it clearly traces back, we just haven't figured out that part since we just stumbled upon these searches late last night.
We live on the north side of Columbus... the phrase 'it's a small world' holds true once again!