That evening my mother, alternating between the small kitchen knife and scrubbing brush in her bright-red hand, was holding the mussels one by one under ice-cold water, all four kilos of them, scraping and scrubbing and rinsing several times - since my father couldn't bear the crunch of sand between his teeth - because he would be coming through the door with his promotion virtually in the bag; not officially of course, but he'd been given the nod from above. Though Mum grumbled jokingly that she didn't care for them much, and complained about her crooked spine, still we weren't allowed to help; leave it, if there's any sand in them then at least neither of you will be to blame, my mother said.