Helen, 43, Cambridgeshire
Silently creeping onto the landing, me and my little sister peeped through the banisters.
From the top of the stairs, we could see a tall man hugging our mum.
'Who's that?' Angela, then 8, asked.
'Must be Mum's new boyfriend,' I whispered.
Our dad wasn't around but Mum did her best with Angela and me, then 10.
Me and my sis were close, loved dressing the same.
I liked life with just us girls but now I wondered if that would change.
Soon after, the man moved in with us.
Glen was 18, a decade younger than Mum and
