I had vague recollections of my father saying he had a brother who died young so I set about trying to find out yesterday. He would never talk about him apart from saying it was a good thing he died young and he never said whether this brother was older or younger.
I found him - born in 1918 and died in 1926 - so older than my father. I remember being told he died when he was 6 but he actually appears to have died when my father was 6. I shall be obtaining both birth and death certificates as I would like to find out the cause of death.
I replied to a message on the http://www.ancestry.co.uk/ noticeboard from someone who's husband's grandfather was the brother of my great grandmother! She'd only managed to identify 8 children in the family but I've found 12. My great great grandfather married twice and I don't yet know who his second wife was - I'm working on it.
I've also found out that my grandmother - father's mother - appears to have had a younger sister which I don't think I ever knew about. My father's parents did not speak to either side - his or hers - of their family so I'm not sure what went on there and probably won't find out now.
I had a good example of the perils of Census transcription. My great great grandfather was Alfred Slator. I knew he was on the 1891 census as I'd found him on FreeCen. There was no way I could find him on Ancestry until in the end I put in the reference for the address I knew he was living at. Bingo! It had been transcribed on there as Lackford Later and my great grandmother was down as Sarah Anne Later rather than Sarah Jane Slator! I have filed the appropriate corrections.