Your father's children will inherit his share. The aunt has priority to administer the estate but you have the right to do so if she does not and have the right to notices and accounting.
If your Uncle died with no spouse and no children, the estate would first go to his parents. If his parents are also deceased, then the estate would go to the issue of the parents. If the decedent had brothers or sisters, they will inherit the estate. If there are deceased siblings, and they had issue, the issue will inherit the share of the estate that the deceased brother or sister would have inherited. In your case, if your uncle's parents are deceased, your aunt and your dad's children would inherit. Your aunt gets half and your dad's children get the other half.
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Estate divided among Aunt (50%) and fathers children (25% each).
Aunt has priority to be appointed to be appointed executor to probate estate.
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Nothing gets divided until a probate petition is filed by a family member seeking authority to probate your uncle's estate. When it is done properly under court supervision, the uncle's estate will be divided half to the surviving sister and the other half to the children of the deceased brother. Get help from a probate attorney.
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