My kids age 4, 7 & 10 are having a hard time dealing with our new divorced family structure. They miss their dad (who has been very irregular about visiting or calling) and they seem angry all the time. Small things cause my daughter to burst into tears or a tantrum. I'm getting frustrated with all of them because they're all so touchy so I'm starting to lose it also, which I know isn't good at all. Is there some way to help them deal with this more calmly?