There are a lot of family members on this site with experience to share. I did some looking around for you. Have you gotten in touch with the Schizophrenia Society of Alberta? They will know the ins and outs of the local legislation and services. The family support groups are also a good place to get local information and support in figuring out how best to get your brother help. They won't care whether his diagnosis is schizophrenia or bipolar, they will still help you. http://www.schizophrenia.ab.ca/index.ph ... pport.html
The strengthening families together program (also on their site) could be good for your family members as well, to make sure everyone is on the same page in their knowledge about the illness.
In BC I don't think guardianship is used, but our mental health act has something called extended leave, which is meant to make sure that a person stays on their medication and treatment when released from hospital. I would ask the Alberta Schizophrenia Society whether Alberta has extended leave or community treatment orders and how to access that. Here's the mental health act info for Alberta: http://www.albertahealthservices.ca/mha.asp
You do seem to have community treatment orders, which is good. The act also has this provision for involuntary treatment, similar to BC:
When a physician examines a person and is of the opinion that the person is
a. suffering from a mental disorder,
b.likely to cause harm to themselves or others or to suffer substantial mental or physical deterioration or serious physical impairment, and
c.unsuitable for admission to a facility other than as a normal patient,the physician may, not later than 24hours after the examination, issue an admission certificate in the prescribed form with respect to the person.
When reading section B above it is important to notice the last part of the sentence. Your brother doesn't have to be harming himself or others or likely to do so, but can also be admitted without his consent if his health will badly suffer if he doesn't enter hospital. This is important, as self neglect and being unable to take care of himself can become grounds for admission. The problem is often that services are underfunded and there aren't enough beds, so hospitals will be inclined to be very thrifty in who they admit and how long they keep them, not usually a good thing. My suggestion is to print off and bring this documentation with you, and keep a journal of what you observe with your brother so you can help make the case to have him admitted when he needs it.