How do i go about having my stepbrother removed from my mothers home even thou my stepfather lives there also ?
You should certainly go and talk with a lawyer about your question. It is not possible for anyone to answer this question with any depth without some factual basis or context. The immediate question is: why do you want your step brother removed? Is he a good person who is being abused or a bad person who is causing trouble? The answer you seek from an attorney will depend on which side of the question I asked above your concerns lay.
You captioned your question in the Elder Law category. You can call the state bar of NM and talk with someone there about a referral to the elder law section of the bar.
You can often find "free" legal help centers in the district court of the town where you live. With your zip code I would suggest that you consider the court in Albuquerque or call the law help NM hotline. Those places can help you better identify the legal issue you want to ask about.
Good Luck.
Law Guru