The Movie is a sci-fi thriller with aliens and a black ufo

The aliens are probably monsters but I don't remember how they looked.

Two brothers find a black ufo somewhere may be in their backyard.

The cop here has many copies they are all same and aliens probably

One of the brother suddenly grows tall overnight .

These are the things I remember and I don't know the name because I watched it in my childhood.

So comment the name if you know or have watched it.