my grandfather died and left his assets to his grandchildren. My uncle was in charge of the distribution of the assets. How do I know how he distributed? When I asked him he dismissed me.
As a beneficiary [either under the Will or in intestacy] you have a right to an estate accounting from the executor/administrator.
If your uncle is "in charge" and he won't give you even basic answers, it's time to hire an attorney and file a complaint seeking an accounting in court.