I am very sorry to learn of your mother's death, and of whatever additional sadness she and your family may have experienced as a result of the priest not coming to anoint her; and for the same loss when your father died.
I believe that the bishop can and should deputize "elders" (persons who are known to their pastors for their faith and compassion) to anoint the sick in the absence of the priest. The practice of the ancient church emphasized the unity with the bishop which was implicit in the fact that the bishop had blessed the oil.