Isaac Jacobs arrived in New South Wales in 1838. He had a child, Isaac Henry Jacobs, in 1847 with Mary Craft, a year before he married his wife Margaret Campbell.
'Jacobs, Isaac Abraham (1823–1889)', People Australia, National Centre of Biography, Australian National University, https://peopleaustralia.anu.edu.au/biography/jacobs-isaac-abraham-27854/text35610, accessed 8 February 2023.