paulad on Family Tree Circles

I am looking for information on John and Mary Duggan who lived in the eastern suburbs of Sydney around 1900. As far as I know they came to Australia from Cork, Ireland and had 5 children one of whom was my grandfather, Frederick David Duggan who was born 1903? and married my grandmother Irene Bourke in 1928. Frederick died in 1950 from injuries sustained in WWII. I have no information about his sibblings or anthing else on his parents.
I am writing a family history for future generations and would love to trace the line back to Ireland.

I am looking for information of the relatives of David Grosvner Williams born at Stockton in NSW in July 1908 -1909, my grandfather, he married Mildred Kathleen Thorne, my grandmother. His father was David John williams who died at Cessnock in 1936 and his mother was Lillian Violetta who died at Marrickville in 1946.
I think David John Williams was the son of Patrick and Anne but I have no information on them. I would love to find out more about the family as I am writing a history of my family for future generations.