I don't think that you have the right parentage for Joseph Antoine Maxwell. My great aunt Ruth wrote up the history of her Maxwell family and she knew Armstead's family and she makes no mention of a Joseph. Armstead's children were Leonard, Charlesworth, Columbus, and Sarah. See my site at http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&d...
I will be happy to send you Ruth's story and help you find Joseph's parents. I would also be interested in seeing what you have on Leonard's other family that moved to Missouri, because I have not been able to find them.
My email is on my page, so contact me there. Look forward to hearing from you.