I think you just got to the root of the problem Gramma. SHE DOESN'T HAVE CONSISTENT NIGHTLY SLEEP. I really believe that children need routine and it makes them healthy and happy. That's why, once they settle into daycare life they are so great with us. We follow daily routines and schedules. You really have to suggest to this family that they set up a bedtime routine and stick to it and give routine a try to see if things improve. I bet they will improve and I hope they thank you.