Your father's younger unmarried brother died intestate and now there are no surviving class I legal heirs to succeed to his intestate properties.In this case your father is the only surviving class II legal heir of his deceased brother to succeed his intestate properties. His elder brother predeceased the younger brother who died subsequently, therefore,since he was not living at the time of the death of his unmarried younger brother, his siblings cannot stake a claim in the said intestate properties left behind by your deceased uncle. Therefore it is only your father can inherit the said property in full and he does not have to re-distribute the same to the siblings of his deceased elder brother, they are not entitled to any share in the property as per law while there is a lass II legal heir living.