I might be very unreasonable here and I'm prepared to be told so.
...but I find it hard to believe that a 4 or 5 year old child can write 30 Christmas cards, with all the children's names on both the card an envelop and also write merry Christmas on all of them 
I wrote my son's cards to take to his classmates and it was hard work. He sat next to me and was excited about it. But there is no was he could physically do it. I wrote it with my own handwriting, not faking his.
I understand that he is one of the youngest and some children are almost a year older which can make a huge difference but still...
Am I being unreasonable to think that parents are writing the cards in a messy way to pretend it was their children? Maybe I'm worried and a little jealous that my child can't do it.