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She told me that DD had talked so much about her older brother in vivid detail that she thought I had an older son even though she was pretty sure I just had 2 girls

Ha ha ha! This happened to us, too! DD convinced the workers at her daycare that she had a baby brother named...I forget what, but something completely ridiculous. Now, DH DID do dropoff and pickup, but still. They asked him, sounding sort of embarrassed, if I had had a baby recently. I think they mostly knew I hadn't, but she was just too convincing.

The funny thing is that soon after this, I DID get pregnant with her little brother.