Guessing you know about this?
http://nla.gov.au/nla.news-article76049902This is about the inquest into son Wm's death as a jockey
http://nla.gov.au/nla.news-article113267155There was possibly another son George, who died in 1877 in Coonamble NSW (ie before his mother's death so could be one of those deceased males)