I currently have two kitties that do not get along. But the difference for me is that neither cat is stressed out and there is never any fur flying or bloodshed when there is a tiff. Plus I think it is mostly an act on Paizly's part. But she can scream sometimes like she's being tortured.

It is a horribly difficult decision. But I think it is great that your parents will take Havoc. That sounds like the best solution for everyone.