Monica,
I feel like I can copy your post and paste it into my thread. I have S4 and S2. I try not to cry in front of them. But sometimes it all gets to overwhelming and I get so sad adn I can't help it. S4 says, "mommy, just be happy". That breaks my heart. But I, too, tell him that it's okay to be sad adn everybody is sad sometimes. Maybe it's better that they see us show our emotions. Maybe they'll learn that sharing your emotions is healthy (unlike how my H was raised, and now look at him).