Answer:
Grandpa is kind because he shares his cultural stories with not only his relatives, but also with children who aren't part of the culture but wish to learn about it.
Step-by-step explanation:
Remember that evidence doesn't just mean to explain your reasoning! You'll also need a quote from the story to prove what's written above. I don't have a copy of the text on me, so I can't do this for you. Look into the text and find a quote that shows grandpa showing kindness by telling the childrens' friends Native American stories.
Best of luck.