Is the mother-in-law’s money, obtained fraudulently from a martyr’s widow's grant, and her inherited estate, permissible for the children?

The default is for the marital bond to remain after its عقد (contractual agreement). The wife's claim of divorce is not accepted without proof, especially since the wife vehemently denied it. A husband may divorce his wife and then take her back (راجعها), and some people may know about the divorce but not about the رجعة (revocation of divorce). The default is for things to remain as they were, and certainty is not removed by doubt. What results from the claim of divorce, such as the wife's ineligibility for the grant, is not to be paid attention to. The wife's money and inheritance are lawful until proven otherwise.