My grandfather is very kind-----me.应该填to还是of啊,这是不是个词组啊

to

be kind of 和be kind to都是词组，但是意思大不相同了~~
用of的话，句子通常是It's very kind of you.意思是你真是个大好人。
用to的话，通常是A is very kind to B.意思是A对B很好。
根据你这句话的意思（我爷爷对我特别好）来看，应该用to，明白了吗？

to
of 是在It si very kind of you这种句型里用的

to
我们通常讲It's very nice of you ........

to
be kind of someting to sb.

My grandfather is very kind to me
to me 是词组