Could my atheist grandfather be in heaven?

My Maternal grandfather Died in November 2009.He had leukemia before.
One month before I dreamed that he was reading the Holy bible,But he never heard gospel
before! Because we are living in a atheism country.And I am a Catholic.

I want to ask that whether my Maternal grandfather is saved by LORD?Or he is in hell or in purgatory? I want to know the truth and this problem had spent me too much time to think.
Thank you for answering. May God have mercy on you!

The following links should assist you in better understanding the Catholic Church’s teaching on salvation for non-Catholics. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.

Recommended Reading:

]* Salvation** from the Catholic Answers Library
]Extra ecclesiam nulla salus***
Salvation Outside of the Church
]* What is invincible ignorance?**

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