Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 1 year ago

 If the grandfather left only grandchildren with out any son or daughter, then all the grandchildren will inherit from their grandfather. But if the grandfather has living children, then his children will inherit him, not his grandchildren.

If the grandfather made a will in favour of his grandchildren, they will get a share according to the will which should not exceed on third of the whole estate, unless other inheritors permit.