Hi Ben,
In SA records I can see same as you: Hugh (Snr) d:1896 age 83y Farrell's Flat. His widow Susan in 1913 age 90y near Burra. Hugh Philip d:1946 age 83 in Adelaide and Agnes Mary 1951 age 73 in Wayville. I assume H.P. McGuire's bride was Agnes WYMAN? Their ages at marriage St Aloysius RC Church Sevenhill at Clare on 11 Feb 1902 are stated as 34 (H) and 23 (W). Not quite consistent with DOD. Issue: 4 daughters: Mary Margaret (m: Wlm RUGE 1924), Lilian Rose (m:John CROCKER 1925), Cecelia Beatrice and Patricia Barbara {1902,04,07,11 resp}
There is a newspaper article Dec 1882 in the Northern Argus (Clare) which names Hugh McGuire, son Hugh (Jnr) and wife Susan.
In 1876 in the Crystal Brook Police Court, a married woman was fined for stealing a pair of boots from a Hugh McGuire
No record of immigrant arrival either into SA. I have not checked Vic. or WA.
In 1863 there's mention of a Hugh McGuire at Toowoomba Qld. No birth or marriage in Qld or NSW. Haven't checked Vic. or WA.
Could he be the Hugh McGuire who arrive 1837 into NSW on the Norfolk and received a Conditional Pardon in 1861?
How do you know he originated in Tyrone?
Do you know when/where the sister married Reilly? I'll be in Adelaide in 2 months, maybe I can check the parish register for witness names and sponsors for the birth of the 4 daughters of Hugh (Jnr) for you. Is this the right family - 4 daughters?