Putting my two youngest to bed tonight, my 4yr old said, 'I'll be sad when I'm grown up because I won't be able to see you anymore'. 'Why's that?' I said. 'Because I want to be a horse rider'. She seems to be thinking that when you grow up, you are either one thing or another, and not, say a Daughter and a horse rider and a Mum etc! So I explained that I would still see her no matter what she was going to be, I pointed…