Looking for Murphy Hastier Spurgeon IN Johannesburg South Africa

Hello
I am hoping somebody can help me find my family in Johannesburg South Africa

My ancestor Mary Quigley Ryan born 1871 in Penzance Cornwall England and her sister Catherine Jane Ryan born 1873 Penzance Cornwall England went to live in South Africa in the early 1900s

Mary was married to John Murphy and had three children:
Dora Elizabeth Mary Murphy born 1894 in Brighton, Sussex, England
John Prideaux Murphy born c1902 possibly in South Africa known as Jack
Thomas Frederick Murphy born c1905 possibly in South Africa

Mary divorced John Murphy and married Jack Hastier
Mary died c1936 Johannesburg, South Africa

Catherine Jane Ryan married Alfred Spurgeon and had one son named Francis Gilbert Spurgeon, Catherine died 1948 in Johannesburg, South Africa
Alfred Charles Spurgeon died 1935 Johannesburg, South Africa

I would be very grateful for any information especially about the children and their families

Thank you
Nancy