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My Dear Grandfather,

How are you doing? I’m doing fine… blah blah blah….

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If you are starting a sentence in an essay of yours…. then it would be “My grandfather”….. and if it is in the middle of a sentence, then it would be “my grandfather”….

Hope this helps!!!

If you say I gave this to Grandfather, that is capitalized because it is used as his “name,” like what you might call him to his face.

If you say My grandfather was a plumber, then No because you are referring to the relationship, not his name.

That’s how I think of it: if you could substitute his proper name then capitalize it.

You only capatalize it if you are using it as a name, such as Dear Grandpa,