"Come here for a minute, I have something to show you."Even at the age of 11, I knew that when I heard the constant clinking of ice cubes and Kenny Rogers playing in the lounge room, Mum was in one of those late-night moods. The family accordion folder was open and there were two pieces of paper on the dining room table. My birth certificate. Her birth certificate.Mum pushed them toward me. "Read it for me and see if you notice anything."Date of birth checked out. My name was there too. So was hers.