Your grandmother was a very special person. Is this correct grammar?

The grammar is correct, but it could be improved for clarity and impact. Here are a few ways to rephrase it:

More descriptive:

* "My grandmother was a truly remarkable person."

* "My grandmother was someone very special to me."

* "My grandmother was a woman of extraordinary character."

More personal:

* "I was so lucky to have my grandmother in my life; she was so special."

* "My grandmother was a very special person who I will always cherish."

More specific:

* "My grandmother was a very special person because of her kindness and generosity."

* "My grandmother was a very special person who always knew how to make me laugh."

By adding details, you can make the sentence more meaningful and engaging.