If your grandfather had an attorney I would contact him and ask about this, I think 2 months is enough time, when my grandmother passed we had the reading within 2 weeks
How Long After Death Is The Reading Of Will?
The lawyer would contact you depending on the will agreement. You can contact the lawyer in which the agreement had been made with to find out the exact date. Different Lawyers have a different time-line, especially during a grieving process.
My ex parnter came into money last week should iget some and my kids