How is the estate distributed for a husband who died and left a wife and the sons of a deceased brother, then his wife (their paternal aunt) died three days later and she only has two uterine brothers?

If the deceased have no debts or bequests, your aunt's husband's wealth is divided as follows: his wife receives one-fourth due to the absence of direct descendants, and the remainder goes to his nephews (his brother's sons) by ta'sib (agnatic inheritance). As for your aunt's inheritance, her two maternal half-brothers receive one-third as fard (prescribed share), and the remainder is returned (radd) and divided equally between them, provided they are alive at the time of her death. Inheritance matters should be presented to Sharia courts to confirm all heirs and rights.