Thank you very much for you kind offer to help. I actually tried to reply yesterday however the ancestry site seemed to be down.
Ivy Grace Shepperd married an Ernest Ryan and maybe had a child, Margaret J Ryan b. 1923 who may have married in the 1960's aged 41. She died quite young mostly likely TB or Spanish flu.
Harold seems to have had no children. He did marry and seems to have died with his wife in the war, most likely during the Bombing of London. He married late to an older widow during the war making the chance of them having children a little slim, although they had been living together for several years before that.
Hubert also married late, in fact just 6 months before he died! But we can assume he was in the relationship for some time before the wedding as he already had a daughter who was a few years old at the time. I have just tracked her down and I think I have her current address. I have just got to get around to writing to her. I have a little bit of trepidation as she is my father's cousin whom he never new existed.
Maurice was born around December 1908. The only records I have found for him were the entry in the birth index, the 1911 census and an entry in the electoral register. However the entry in the electoral register seems to be in error as it has "Maurice Hubert Shepperd". Somehow Maurice's and Hubert's names became conflated. It is most likely Hubert Shepperd not Maurice, as Hubert is shown on the electoral registers living there and at other address with his parents in the preceding and following years but never Maurice.
To complicate matters Maurice often went by the name of Michael Shepperd in Australia. He joined the Australian army during the war and was also drafted into the Civil Construction Corps. In those records he pushes his birthday back to Nov 1905, which he would have had no reason to do as he was already old enough to join up. Unless he wanted to seem too old but I doubt that 3 years would have made any difference. 1905 was also the year Hubert was born.
On the marriage certificate for Maurice and my grandmother and my father's birth certificate his year of birth is also stated as 1905.
So for Maurice we just have a few army records in Australia, a wedding certificate, his English birth certificate and the 1911 census. There seems to be no electoral registry entries in the UK and no death certificate.
There is some vague rumour that he may have traveled the world a bit before coming to Australia as he was supposed to have been good at foreign languages, which would have been unusual for someone from a working class family growing up in the south east of London and he may not have finished secondary schooling according to the army records.
Unfortunately my grandmother refused to tell my father anything of significance about Maurice and she passed away in 1975 a few months before I was born.
I have found some information through the census on Joseph's family but I am not sure how reliable it is. I mean I may have chosen some unrelated records. Joseph served in the Great War and received an army pension. He was born in Ireland, however his situation is complicated as he seems to have been looked after by his maternal grandfather, at least for a time. The relationship between the various members of that household are complex and I am not sure if the records I have found for his father are in fact those of the correct person.
That's the story so far. I am hoping that when I contact Hubert's daughter she might be able to shed some more light.
Thank you for taking the time to read this thread, it is really much appreciated.
Gabe from Australia