I apologise if I am duplicating information posted on other threads, but I think these three cuttings belong together.
https://trove.nla.gov.au/newspaper/article/59714172 The Mail 17 Jan 1925 announcing the pending BROWN-NELSON marriage.
BROWN —NELSON. —The marriage of Hazel May, the second daughter of Mr. and Mrs. C. S. Brown, Paringa (late Wiliamstown), t
o Leslie, second son of Mrs. and the late Mr. James Nelson, Queen street, Adelaide, will be celebrated at St. Mary Magdalene, Moore street, on January 24, 7.30 p.m. Relatives and friends cordially invited to ceremony. No reception.
So Leslie was the second son and his mother was alive and residing
Queen St Adelaide when James (her husband, his father) died. Leslie's father had died in July 1924 as per the following cutting :
https://trove.nla.gov.au/newspaper/article/59025260 The Register 30 July 1924,
late James NELSON of
11 Queen St, City for West Terrace Cemetery.
https://trove.nla.gov.au/newspaper/article/73800787 The Advertiser 26 May 1930
late Mrs Mary Nelson,
11 Queen St City for West Terrace Cemetery
JM