Looking for guidance and/or resources in the Houston area [Substance Abuse/Mental Health] court appointed trustee process

I have an elderly family member that is struggling with some pretty severe substance abuse issues (I believe alcohol), but it also seems that they may have some mental health and/or dementia type symptoms co-occurring. Their children have tried nearly everything, even a temporary psychiatric hold and they got sober and psych help as well (~5 days inpatient care) but refused additional treatment and meds once released. They do not want to be helped.

We are afraid they may harm themselves or someone else if not forced into treatment. I am told that the only real option left is for a family member to become a court-appointed trustee…this seems like a nightmare of a process and overwhelming to even get started.

I would be very appreciative if anyone reading this has knowledge or resources in the Houston area that may be helpful to determine how to navigate this process, next steps, options, etc.

Do I need to see a family law attorney to start? Any in the Houston area that specialize in these situations?

We have reached a pretty desperate point.

Thank you very much.