Right Triangle Propogation

If you use a single, straight cut to make one right triangle into two, smaller right triangles; what can you say about the two offspring triangles in comparison to their parent?

I. Neither offspring can be congruent to the parent.
II. Both offspring are definitely congruent to the parent

III. Neither offspring can be similar to the parent.
IV. One or both offspring might be similar to the parent, or not.
V. Both offspring are definitely similar to the parent.

Dissimilar Right Triangle Party!!