Is it permissible for the daughters and wife of the deceased to fulfill a vow he did not fulfill during his lifetime, taking into account that his assets are seized due to war, and that fulfilling the vow might require incurring debt or relying on the husbands' money?

If one vows obedience to Allah, fulfilling it becomes obligatory. If the vower dies before fulfilling it, the vow becomes a debt attached to the estate. It is recommended to hasten the repayment of the deceased's debt before praying over him, based on the hadith: "The soul of the believer remains suspended by his debt until it is paid off on his behalf." If the delay is due to the inability to sell the estate, the debt remains attached to it. The heirs are not obliged to borrow money to fulfill the deceased's vow, but if they do so, it is an act of kindness on their part, provided they are reasonably certain of their ability to repay. It is not permissible to burden spouses or others with participating in debt repayment unless they do so willingly.