Here is a notice for the wedding of his parents John Michael Galvin and Grace Walmsley Payne.
A full description of the wedding was also included in the same paper.
A pretty wedding was celebrated before a Choral Mass in St. Patrick's Church, Adelaide, on November 21, the contracting parties being Mr. Jack M. Galvin, eldest son of Mr. and Mrs. J. P. Galvin, of Adelaide, and Miss Grace Walmsley Payne, youngest daughter of Mrs. E. Payne, of Adelaide. Rev. Father O'Sullivan officiated.
The bride, who was conducted to the altar by her brother, Mr. E. Payne, looked charming in a dress of ivory silk poplin (tunic effect), and carried a shower bouquet. The first bridesmaid, Miss Annie Walmsley (cousin of the bride), wore a dainty Assam, silk costume and black hat with pink trimmings. The second bridesmaid, Miss Kathleen Dineen (cousin of the bridegroom), was charmingly dressed in a Japanese silk frock costume with black hat relieved with pink.
The duties of best man were performed by Mr. James Dineen, of Mile-End. Mr. Arthur Watts led the choir, Mrs. V. Brown being organist. During the Mass the bride and bridegroom approached Communion together.
At the breakfast, held at the residence of the parents of the bridegroom. Rev. Father O'Sullivan proposed the toast of the bride and bridegroom, and spoke in eulogistic praise of the newly married couple and wished them every success. The bridegroom suitably responded. The toast of the bridesmaids was proposed by Mr. E. Payne and Mr. J. Dineen responded, and that of the parents of the bride and bridegroom was proposed by Mr. F. P. Keogh and responded to by Mr. J. P. Galvin. The happy couple were the recipients of costly and numerous presents. A very pleasant time was spent on the evening of the wedding, when many of their numerous friends were present.1918 'Family Notices.', Southern Cross (Adelaide, SA : 1889 - 1954), 18 January, p. 16, viewed 3 November, 2015, http://nla.gov.au/nla.news-article166985060
On the same day, Jan 18th, 1918 further down the Family Notices this Silver Wedding notice caught my attention. It alerted me to the names of the grandparents of John Michael Galvin and also provided some details about his mother Catherine Josephine O'Neill. Thanks to Trove my Galvin research was off to a good start.