Wow! Thank you all, I'm blown away by all the information you've come up with! I do feel a bit silly that I didn't first check newspapers for information, a lesson learned! Many more siblings of Michael and Phillip have come to light now, and you've found their mother's emigration and death as well! The mother Margaret's husband Michael Tobyn Keon the elder died in Carricknabrack, Drumshanbo in 1877 (with Susan A Keon present), so that ties in with her coming to Australia in 1884 with Bridget and Emily. On rereading my notes, I'm not certain which ship Michael emigrated on as there are 2 references I've found - as unassisted immigrant to Victoria aged 17 in 1863 on the Camperdown; and to Sydney, as assisted immigrant on the Ocean Empress aged 23 in 1864. You were right to suggest I check, Dundee - on Phillip's 1874 marriage his parents are listed as Michael Tobyn Keon and Margaret O'Beirne. Thanks again everyone!