John CHALMERS born at Calton place Glasgow 1779 married Jean Miller CLARKSON, the daughter of William CLARKSON and Margaret ALLAN born at Edinburgh MLN 7 JAN 1787, at Barony Lanarkshire on 9 SEP 1804.
The children, all born Barony LKS include John 1805, Hugh born 1806. William Clarkson born 1807,Margaret born 1809, Jean born 1814, Hugh (stet) 1816, George Clarkson, born 1819, died at Zeehan TAS 1899. Ann born 1822.Francis born 1825, and Agnes CHALMERS born 1828.
Maybe you are not researching this tree but you know who is.