Am I obliged to slaughter two sacrificial animals after my grandmother made a vow to do so upon my graduation from the course, then passed away before knowing of my graduation?

If the grandmother vowed to slaughter after the graduation, and the questioner graduated after she lost consciousness, then there is nothing upon her because she is no longer accountable. However, if he graduated before she lost consciousness, but she was not aware of her illness, then the vow must be fulfilled from her estate. And if she has no estate, it is commendable for her children to fulfill it, by analogy with settling the debt of the deceased. But if what the grandmother intended was not a vow, but a feast of joy for the success, then nothing is incumbent upon her.