This is our version of that perennial favourite, ‘Mummy/Daddy is not a climbing frame’. Sebastian – bless – is a very affectionate child. And he loves his sisters, all three of them, even the grumpy teenage one. But he does rather seem to think that one expresses love through using people as obstacles on a Marines-style assault course. He clambers all over the baby. Sits on her. Stands on her. Kicks her in the face while getting off the sofa. Fortunately she is a tough cookie and it doesn’t seem to bother her. But one day soon, once she’s walking too, I suspect she’ll be after some revenge.