What should parents never do in front of their children?

Well! There are many no, no things in that regard, but I think one should never fight in front of kids. Though, I myself of guilty doing this many a times, but I am correcting myself. Once, we were arguing in our car, when my daughter said, "I will get out of the car, if you both will not stop fighting." Once, I saw my brother and his wife arguing when suddenly their 8 year old son burst into tears. So, kids get deeply hurt when they see the two people whom they love the most in the world fighting. They become insecure perhaps, and it makes them feel that their ideal world, where they all love each other is breaking.