Selonki on Family Tree Circles

My ggggrandfather William Muir(e) e later dropped to become Muir, born 1796 in Roxburgh Scotland married to Mary Ann Winter, was a 1820 settler to South Africa, Iv been trying to find out the names of his parents and birth/death dates and any siblings he might have had. I have most of the tree info down the line to myself. I have tried just about everything, perhaps someone has him on their tree and would like to share the info with me, would appreciate it.

Selonki