This is not a nursing home abuse question. As long as your parents have control over the property they can decide who lives there, unless the behavior of your brother becomes criminal. If you have POA for your father you could move to evict your brother, but this may cause your parent stress as well.
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It appears that your father owns the home. Your father would have to evict him.
You might want to call your local policing agency - police, constable, sheriff and talk to them.
If he's possibly violent you might want to warn them about him.
Also if your brother is abusing an elderly or disabled person, there is Adult Protective Services.
If your brother is a danger to himself or others, then there is HMHR - Harris Co. Mental Health and Mental Retardation. You can try to get him committed and assessed.
I hope this helps.
If your dad is very frail, then perhaps you need a guardianship over your dad. That requires court intervention.
You probably need to meet with an attorney that specializes in the elderly.
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