Is it possible to fulfill the vow of a deceased father by slaughtering an Eid sacrifice with the intention of fulfilling the vow?

The father's vow is a debt upon him, and it must be fulfilled immediately. It is permissible for the son to pay it from his own money, for the Prophet, peace and blessings be upon him, said: "Fulfill Allah's right, for Allah is more deserving of fulfillment." Every right established in the deceased's debt, such as expiation, vows, or zakat, is attached to the pilgrimage. There is no harm in fulfilling the vow at the time of the sacrifice, but it is not permissible to combine its fulfillment with the sacrifice using a single animal.