miscommunication

my mum and friends had a small gathering at our house just now...
they had a port luck dinner...
everyone did some simple food and shared out the varieties of food...
there's some miscommunication and one of the aunt wishes happy birthday to my mum through facebook...
then the other aunt saw the comment and she started preparing a cake this morning...
when she reached our house, she wished my mum happy birthday >.<
Then, they found out that it is my birthday but not my mum's...
Finally, i'm the one who gained =)