I too am tracing the above line.My maternal grandmother was Marion Penman born July 1877 in Larkhall.
Her father was James Penman born 1851 in Glasgow, the natural son of Marion Penman born 1817 in Stonehouse, Lanarkshire.James Penman married Jane Meikle from Larkhall in 1873.
The above Marion Penman also had another son in Glasgow.
Her parents were David Penman and Agnes King and like the earlier writer I have been unable to proceed further.David Penman was born about 1780 in Stonehouse, Lanarkshire and married Agnes King in 1808 also in Stonehouse.
Can anyone go back a little further and supply further information.