I am looking for decendants of the following Burt/Birt family.

Walter Burt (Birt) who married Mary Ann Conway Bourke in Melbourne, Victoria, Australia in 1871 Registry entry 655 for 1871.
Walter was born Cornwall, and Mary Ann Conway Bourke born Limerick Ireland according to the registry entry. They had the following children : Ethel Lillias Burt born Richmond, Victoria in 1872 registry entry 18906. Edith Mabel Burt born Richmond, Victoria 1876 reistry entry 23385, and Elise May Burt born Richmond 1876 registry entry 11687. Edith and Elise's births were recorded under the family name of 'Birt' not Burt.

Ethel Lillias Burt married a George Roots in 1893 registry entry 6144.Ethel and George had the following children: Lillias May born1894 West Hotham, Ethel Mabel born.1896 West Hotham, George Richard born1900 died.1900.
Lillias May Roots married a Charles Ridgeway in 1911 registry entry 5827& 5827R.

Edith Mabel Burt (Birt) married Herbert Thompson in 1896 registry entry 1521.Edith and Herbert had the
following child: Edith Thompson born.1901 Carlton, died 1901.

Elise May Burt (Birt) may have married a John Robert Kennedy in 1909 entry no 748 as Elsie May Burt, and or Herbert Thomas Reeves in 1911 registry 6218 as Elsie May Burt. Elise May Burt and Herbert Thomas Reeves had the following children: Lily Emma born Broadford Victoria 1912 registry entry 17812, and Herbert born.Footscray 1913 registry entry 21949.