Thomas married Mary Anne Smithwick on 20 Aug 1839 in Co. Tipperary, IE. Mary (daughter of John Smithwick and Ann Surman) was born on 11 Nov 1812 in Loughagh, Co. Tipperary, IE; died on 5 Oct 1893 in Armadale, Melbourne, VIC, AU. [Group Sheet] [Family Chart]

1. John Gaggin was born on 26 May 1841 in Co. Cork, IE; died on 8 Jun 1920.
2. Anne Isabella Gaggin was born on 30 Dec 1843 in Co. Cork, IE; died on 25 Dec 1861 in VIC, AU.
3. Thomas Wakeham Gaggin was born on 27 Jun 1845 in Co. Cork, IE; died on 6 Mar 1922 in Glenferrie, Kew, VIC, AU.
4. William Wakeham Gaggin was born on 23 Nov 1847 in Co. Cork, IE; died in 1925 in VIC, AU.
5. Jane Henrietta Warner Gaggin was born on 26 Jan 1852 in Co. Cork, IE.
6. George Gaggin