I'm looking for descendants of the Broughton family in Sydney, Australia to see if they can shed any light on the life of my first cousin, his wife and their child.

The Broughtons were in the Newtown, Marrickville, Petersham and Ashfield areas clustered in west (now classed as inner-city) Sydney. They came from Argyle, NSW and spent some time in Crookwell before moving closer to the city.
Marjorie M Broughton was a granddaughter of Richard and Sarah Ann J Broughton (nee Wright). She married my first cousin Nat Morris in 1931.

Marjorie was a machinist in the garment trade and prior to marriage she was living with her mother in Palmer Street, Darlinghurst. Seemingly there was no father present and none is listed on the birth record leading me to believe that Marjorie's mother, Amy Clara/Clair Broughton (1883-1934) bore Marjorie out of wedlock. Amy continued living at Palmer Street until her death three years after Marjorie and Nat married.

Nat was from a Russian-Jewish family of Glasgow where he started out life as Larten Slatopolsky. He took Nathan as his gentile name, a common practice to seem more Western. The story goes that he absconded from Scotland without telling anyone, leaving the family "heartbroken" as it's relayed, and came to Australia. Here he shortened his first name to Nat and took his father's first name as his new surname, thus becoming "Nat Morris" (and more or less untraceable). The family eventually tracked him down somehow but he refused to have any contact with them in his new life.

Marjorie and Nat settled in Newtown where Nat worked as a presser in the garment trade. They had one known child, Frank Nathan Morris, who died at a few years old in 1937 (I'm guessing he was five or six at the time). Presumably the line then died out.

I'm hoping there may be descendants of Amy's six siblings (including her twin, Ethel Virginia Broughton, known as "Virgie") who may have some information on the couple.

Below advertisements from The Sydney Morning Herald,Tuesday 23 May 1922, for Sarah Ann J Broughton's death lists most of her children, their spouses and grandchildren.