It is a fairly common practise in many countries for families to sleep together this doesnt mean there is child abuse, it is the individuals choice. If the child is screaming and unhappy perhaps something else is going on, does she get on well at school is she social, have fri..ends what is her health like as a whole. Maybe her parents could set some bounderies on the behavior, what does she curse at her Dad about, it is he that needs to set bounderies and re-enforce that it is not permitted. Possibly the child /Parent interaction requires Improvement