If you must move the mother cat and her kittens, it is important to do so carefully and with minimal disturbance. Ensure that the new location is warm, draft-free, and quiet. Place the mother cat's bedding and the kittens in the new location, and allow them to settle in. Providing additional sources of warmth, such as a heating pad or warm water bottle wrapped in a towel, can help to keep the kittens comfortable. Monitor the mother cat and the kittens closely for any signs of stress or discomfort. If they seem agitated or restless, try to limit any disturbances and give them time to acclimate to their new surroundings.