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Sorry! I always remember learning in Biology that whether you can roll your tongue or not is genetic ie the world is split into those who can and those who can't. Last week we tested this with DH's family - I can, our DS can, SIL (DH's sister) and her DDs can but only DH couldn't. Bit odd that a brother can't but a sister can.
Yes I remember hearing something about tongue rolling being genetic, my Mum can't do it, it's amusing when she tries! My Dad can. Can't remember about my Sisters and Brother. Will have to ring them and ask!