Greetings from Malcolm Chalmers, and (by Liesl van den Bergh) children Dirk William and Nikola Alia this Chalmers line as far as I know it:
John Chalmers b. circa 1784 + Jean Miller CLARKSON
George Clarkson 10 DEC 1819 married Ann Minogue (charged with murder in 1901- not convicted)
12 AUG 1822, died in Tasmania 26 NOV 1899
William Clarkson CHALMERS married Martha Ann born 1870 in Woods Point,Victoria,Australia.
He died on 7 Apr 1933 in Johannesburg,South Africa in a mining disaster rescue attempt.
Which brings us to my father, William McMahon Chalmers, alive and well in his 80's in Pinetown, South Africa