You are very lucky to have that man as your Grandfather!
The middle section of your writing needs many corrections and changes for grammer, punctuation, incomplete sentences, etc. I suggest that you read it again and try to make changes. I have a suggestion for the first and last sentence. I hope my suggestion is helpful to you.
I admire my Grandfather more than any other person because of the things that happened when I was a young.
When I think of my Grandfather, all my memories come back to me and I cry because he was a very nice person with me. I pray to my God for my Grandfather because I think he is with God.
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