200 Years to Christmas — J.T. McIntosh

For almost two centuries the huge spaceship had speared its way through the stars, bound for another two hundred years of travel before it would put down on a new planet. It was up to them to start life anew, to correct the mistakes their ancestors had made. But as the tenth generation neared maturity, the passengers found themselves face to face with the same problems, and this time there was no place to run and hide...