I guess they could be cousins - boy, you have a lot of info! I don't have anything further back than Hiram; no parents, siblings, etc.
My Hiram was born in 1835 in Moniteau, Missouri and died in 1913 in Jefferson City, Missouri. That's all the info I have on him - no spouse info, either.
I guess I've hit a brick wall with Hiram, but I'll keep trying. Thanks so much for your help. And have a wonderful Thanksgiving!!