Hi Do a Google search for Nelson BC - a beautiful city/townhttp://en.wikipedia.org/wiki/Nelson,_British_Columbiahttp://www.hellobc.com/nelson.aspx
Chas. is an abreviation of the given name Charles.
eg same as Tom is Thomas. Bob is Robert - Jim is James etc.
Charles A. AUSTIN is your Great Grandfather - born 1863 in New York U.S.A? What is your source of for this information?
What name does the letter A. Stand for ?
Have you searched USA Census 1920 1930 1940?
Where do the alternate spellings of ASTON/ AUSTON ? come from ?
Charles was your Great GRandfather - Where were your Grandparents born, settled etc - Where were your parents born settled ? PERHAPS you can find some connections - through family obituaries etc.
Name of your GGrandmother - etc