It is always difficult to watch someone we love suffer and I can totally understand how you are feeling.
When it comes to mental health, there are still a lot of stigmas attached to it, and a lot of misunderstandings as well.
Your parents are of the generation where it was not talked about as openly as it is today, so I am sure this is a huge adjustment for them as well.
You say your brother has begun taking medication for his illness. This is a good start for someone with schizophrenia as it will alleviate those symptoms which may cause violence and irrational behaviour.
He will receive regular support from his psychiatric team, who will assess him on an ongoing basis.
For you, can I suggest that you look for support from people that have had similar experiences?
If you go on to the SHINE website, it will give you information on local support groups that focus on schizophrenia.
Unfortunately, it is not an illness that is curable, but it is manageable.
For now, you need to know that your brother is taking the necessary steps to recover and live a healthier life.
I wish you the very best in your future.