It's just that the thing you never understand about being a mother, until you are one, is that it is not the grown man - the galumphing, unshaven, stinking, opinionated off-spring - you see before you, with his parking tickets and unpolished shoes and complicated love life. You see all the people he has ever been all rolled up into one. I look at him and see the baby I held in my arms, dewing besotted, unable to believe that I'd created another human being. I see the toddler, reaching for my hand, the schoolboy weeping tears of fury after being bullied  by some other child. I saw the vulnerabilities, the love, the history.