I'm delighted that my daughter and son in law are expecting their first baby in August - as are my 2 granddaughters aged 4 and 8. But for some reason it will will to me that the 8 year old will come asking exactly how it got into Mummy's tummy. What do I tell her? She is very fond of her step dad - I really don't want to put her off him in anyway but I don't want to lie. We have already done the whole giving birth thing but that was easy in comparison. I would welcome any advive particularly from those whose new baby has a diifferent father from their elder siblings.