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The Estate has not been distributed as it should have been. The correct way was to divide the Estate into 6- so that each surviving sibling receive a one sixth share, and the respective one sixth share of any siblings who had died before your Uncle goes to the sibling's child or children in equal shares between.
So, for example- your sister's one sixth share should have passed to you.
-If any siblings have dies before your Uncle, leaving 2 kids, each of these kids should have received a one twelfth share.
I hope this assists and sets out the legal position.