DD is 5, has been behaving terribly since half term. In reception - behaved fine for the first few weeks, terrible since after (coincidental with the flu vaccination she had on the first Monday after - I tried to blame that for 2 weeks but no). Genuinely terrible, tantrumS, can't take her anywhere as she kicks off, little brother has started copying her, she starts to scream and shout and tantrum like a two year old. "I hate you. You hate me, nobody loves me etc etc". Stamping feet and so on. I've tried calmly reasoning and sadly I've shouted on a couple of occasions. I don't believe in threatening things you won't go through with but tonight she was so awful I said we would not be going to Father Christmas tomorrow. Unfortunately there is her little brother and her friend involved in the trip. Arghhh. What do i do? AIBU to spoil the trip for them all?