It isn't a very nice movie! Disgusting, sadistic, violent, and occasionally funny Hong Kong Category III film. Only truly sick people will watch it. Of course I have had the DVD for decades and grabbed the blu-ray as soon as it was available. Of the many alternate titles, I like best "Human Meat Roast Pork Buns".
https://www.imdb.com/title/tt0103743/
The children are only briefly onscreen so it is not an FLM film -- but it has been mentioned somewhere else in this very long thread. I think it is mostly for fans of extreme violence and serial killer movies.
For the morbidly curious,
720p with optional English subtitles, age-restricted: https://www.youtube.com/watch?v=XLdkpIe4xNc
720p with hardcoded English subtitles, free to all: https://tubitv.com/movies/559701/the-untold-story