I was a twin too, my Mum miscarried my twin.
I only found out I was a twin about 5/6 years ago. I always thought my Mum had a miscarriage between having my sister and having me, not during a pregnancy.
I know what you mean Vicky about not feeling complete.
i found out when i was 16, funny i wasnt told before that - i think it was to do with my mum and dad having split early in my life - but he didnt know either!!
he was a marine and away at the time i was born - he received a telegram saying 'you have a baby girl' and that was it - he knew nothing of what my mum was going through. I think she chose not to tell him as it was a boy she had lost - and he was desperate for a boy - she might have thought he would blame her? i dont know but its sad they couldnt talk about it