Did anyone see Kubo and the Two Strings Animated Movie?

(Spoiler Alert)

I watched this movie a couple of nights ago. I liked it, but felt like I must have missed the main point, or the conclusion, at the end of the movie.

Why, at the end of the movie, after fighting the evil monster that was Kubo’s grandfather, and his two evil aunts, it turns out that old dead grandpa was actually a lovely fellow, who everybody in the village loved?

In the beginning of the movie, we are told that Kubo’s grandfather stole one of Kubo’s eyes (and that was just the least of it). Kubo’s grandfather, mother, and his 2 aunts were not humans, they were some type of spirit/monster beings. Kubo’s mother betrayed them by marrying a human, Kubo’s father, then all heck broke loose. So far so good, as far as me understanding the plot. I think.

Apparently the evil monster grandpa stole Kubo’s eye so that Kubo would have to return to the monster spirit world to retrieve it, so that he would take his rightful place in the realm of the evil grandpa. Grandpa was pissed that one of his daughter’s married a human.

Then at the end of the movie, after the bad grandpa/monster was vanquished, you see Kubo talking to the spirits of his parents, both of whom are deceased at this point, and the spirit of his grandfather. The whole town comes out to chat with spirit grandpa to tell him what a terrific guy he was in life. What did I miss?

Was grandpa a monster or not? Or was he a human? What about those evil floating aunties whose lips didn’t move when they talked?

Great animation in this movie, by the way, I just think I missed a major theme of the film: (