All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
This wife has the right to inherit from her second deceased husband in the same manner that she inherited from the first husband. Similarly, her second husband’s son inherits what remains from his [father’s] inheritance after all the heirs who have right in the inheritance take their legal shares.
Finally, it should be noted that it is the Islamic court that puts an end to the dispute among the heirs. In case there is no Islamic court, then take the matter to any authority that acts on its behalf like the Islamic Centers.
Allaah Knows best.