I watched all 3 movies and I'm confused as hell at 3rd ending. Y is there still a grudge if they got there revenge and at the end the one that died is alive and then the movie ends. Why is she still there doesn't that ruin like the whole movie?

Because the one guy killed the original grudges sister, and their mom was some weird healer lady and she fed them all the evil, so when he killed her out of rage and anger she came back as a grudge as well. At least that's what I got out of it

Well the little girl drank the blood too so she would be cursed and then the regular grudge that was saposed to be gone because of that appeared at the end so it doesn't make sense its like never ending even if you kill the little girl because she will grudge the killer...

That was the sister of the grudge coming back not the original grudge, and its supposed to be never ending because it's a scary movie