Smaking the dogs with newspaper will not train them to do anything except be afraid. I don't think them peeing outside while the girlfriend is away is a pack issue. With consistant and timely training they will learn, and I would suspect maybe you are providing them with the consistency they need that maybe the girlfriend and daughter are not giving while they are there. It does take time for them to get on a schedule and learn.
As for the bed, I agree that jumping can be harmful to their joints so lifting them on and off is ok. You can provide stairs for them.
Please don't hit the dogs....ever!
__________________ Shelly and the girls Moka Mylee |