Time to see things from the child's point of view. If the child is looking forward to a visit to daddy's house, and is prevented from going, s/he will be disappointed, possibly to the point of tears. If this happens often, the child will probably resent the mother for causing this situation. I know it is only too likely that the mother may blame the father, but when the father does see the child, he can explain that this is not so. If the situation continues, and if there is any suggestion that the mother is turning the child against the father by blaming him for the lateness and therefore the cancellation of the visit, it might be time to call in a (divorce court's ? ) social worker.