help!

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I need to know if it is just my children or is this normal. I have two sick daughters on my hands right now, they have been this was for about 4 days now and they are getting on eachothers nerves. They seem to be fighting more than playing which isn't like them, normally they are very happy children who love to play together, but when they are sick, they tend to be pretty miserable. I talked to my friend about it and she told me that her kids aren't like that and told me that maybe my daughters were going through the terrible twos a little late. I am thinking now that I shouldn't have told her. I mean I was under the immpression that most children tend to be grumpy when they are sick but this friend of mine has made me think differently. So are my children the only ones that get grumpy? How do your children behave when they are sick?