George Muir Brown looks like a Scottish name so I looked him up on Scotlandspeople. He was born in 1865 at Kinning Park in the parish of Govan, on the south side of Glasgow, parents George Barr Brown, joiner journeyman (i.e. a worker, not owning his own business), and Isabella Dewar.
Harry
PS I hope the birth-certificate is legible. The original was too large to attach here so I had to compress it.