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Mine don't do it much, but I remember my brother and I being complete pains when my mum was on the phone when we were that sort of age. And of course she couldn't get very far! We would generally be quiet, but would basically sit on her, make stupid faces and so on. Must have been so annoying!
I always taught DS that he could only interrupt me on the phone if he needed to tell me a) the house was on fire or b) his sister was having a seizure - anything else can wait. Seems to have done the trick!
Yup, all the time! I have 2 12yr olds, and no matter how many times I tell them, it doesnt seem to sink in that any call has priority over what they want to say to you, and that nothing is more important than their need/question/tattletale they have come to bother you with...