Whats the name of the movie?

I have been trying to think of the name of this movie for years; its about 3 children who somehow find a cave where there are monsters (the monsters are iki waks or something ugh) and the monsters have the childrens parents or sibling and they have them in a huge iron cage (kind of like a bird cage but its huge) and the monsters are brown the kids kind of look dirty i beleive its and older boy (about 12) a girl ( 9-10) and a younger baby (2 years old maybe 5) seriously i can not remember the name of this movie