Could this be schizophrenia?

It sounds like something on the spectrum (it could be bipolar, schizophrenia, or something similar - only a psychiatrist can tell for sure.

Try to get him to go with you to see a psychiatrist or psychologist - find something that he can agree with you to see him about - it might be sleep issues, or stress, or anxiety or depression or not feeling good… just get him in there, prewarn the psychiatrist and share a much as you can with the psychiatrist before hand.

Here are some resources - do you have other family members that can help you. Educate everyone, and keep a journal about your brother’s behaviors and beliefs so that you can share it with the mental health professionals.

Study this document:

FIRST Aid for Psychosis
http://www.schizophrenia.com/sznews/archives/005561.html

How to get help:

Here is a good place to get your father to, if you can:

I recommend you watch these videos:

I Am Not Sick, I Don’t Need Help! - Dr. Xavier Amador - Pt. 1

and

I Am Not Sick, I Don’t Need Help! - Dr. Xavier Amador - Pt. 2