The information I have is that Owen and John Terence were born sometime later, by the time John Terence (my grandfather) was born two or three of his brothers were already deceased, and I have been told about the memorial to them, my mother apparently has a photo of it stashed away somewhere.
Catherine died when John Terence was about 10 yrs old (1928 ish) and Peter died about 6 or 8 years later.
Owen arranged the sale of the property, split the proceeds with John Terence and they parted ways, Owen headed to USA where he apparently fathered twins, who died in a car accident I am told (although this may be myth and legend!)
John Terence joined the Royal Airforce in UK, served in WW2 (as a bomber?) and then migrated with his wife Agnes Sophie nee Davies and baby Diana Kathryn to what was then Rhodesia (my birthplace & his final resting place) where they had a second Daughter Helena Maeve. His descendants are now in UK, South Africa, Australia & New Zealand.
I will try to find out some further information regarding James T & his wife for you, as with Owen.
I do not know of a link with Hayden Tormey, but will investigate further (the Haydn in my name comes from my maternal grandmothers side, who are decended from Carl Maria von Weber,the composer trained by Haydn & cousin to Mozarts wife Constanze).
I will keep you posted about any further developments in my investigations!