I would be very interested to hear from anyone who has any information about Miller himself, his family, or the British community in Sao Paulo and Santos a hundred years ago and if he still have family live in Brazil right now?
I know that Charles Miller is the English immigrant who brought the first soccer ball to Brazil, but more than this I don't know. If I'm not mistaken club Corinthians was founded by English immigrants in São Paulo at the end of the XIX century, but I don't know if Charles Miller is realted to them.
There was an article in O Globo in June or July this year when I was down in Brazil about Charles Miller's descendants! Maybe they have an online archive you can check out?
I don't know if you've seen this already, but this is on a site I frequent regularly: http://www.futebolthebrazilianwayoflife.com/research.html