1. Once you tell someone something there is no way you can control who else is going to be told. If it's important to keep it secret in order to keep it safe, then tell no one. Benjamin Franklin, who when he wasn't some jolly fat guy flying kites and doing general good works, was a high ranking member of a revolutionary vanguard who went up against the greatest power in the world - not just King George III, but the entire idea of kings in the first place. Had any of them been caught or captured (as several were) they would have been executed as traitors and enemies of the state. So old Ben said something in his profound wisdom, something that today the Hell's Angels (no strangers to vast criminal conspiracies themselves) also love to quote:
Three can keep a secret if two are dead.
You can not EVER tell another person something and control who they are going to tell it to. And I think that goes double for moms.
2. As someone who has intimate knowledge of at least part of your problem, the part where your brother is beginning a tour (and I say it's only a start because all the warning signs are there for further escapades with the criminal justice system) of state institutions --- I used to, and at times still do tell people that I went to the State University, and my brother went to the State Prison - and the big ones, San Quentin, Folsom, Solidad -- that you can love him, support him, visit him, write him letters, don't disown him as others might, but never, ever make a decision based on causing him pain, or discomfort, or disappointment, or not living up to his expectations. He lost that right when he acted in a manner that got him put in jail. Since he obviously cares nothing about other people - oh sure he's say he does, but the actions never back up the words - you have to keep some things at arms length from him. Some guy who's getting 3 hots and a cot at state expense there at the free motel has a lot of damn gall telling anyone else that they are acting against god, and you need to just discount that kind of thinking on his part. Really, what would he know about that? I love my brother. I know he loves me. When everyone else abandoned him, I didn't and he is fiercely loyal to me. That love however did not protect me, or preclude me being on the back of his Honda Gold Wing having my life pass before my eyes every second for more than 40 minutes while he was involved in a high speed police chase. So take anything he says with a pillar of salt and take strength in the fact that you are not going to listen to his thoughts on how to live a good life and all that, since he obviously doesn't know. Criminals are not exactly the sharpest tools in the box, but most criminals at least know enough not to go all helter-skelter in a court room.
3. If you're having a problem with demons then you have two choices. One is you can battle them on their terms. Spiritual warfare against spiritual powers. I'm pretty sure such things involve (as they do in the Bible) human and animal sacrifices, exorcisms, prayer wars, amulets and magic. Bells seem to have some weird power over them, as does fire - the ultimate purification. Also putting sea salt around the perimeter of an area might keep them away, they seem to fear crucifixes, holy water, and consecrated olive oil. Sage also seem to be of some use, and has the added benefit of making your house smell better. Largely though I'm pretty sure you're toast. The Catholic Church for centuries and centuries - millennial even - practiced the casting out of demons, but they have all but abandoned it based on modern psychology and the fact that most of the people they tried to exorcise died in the process. Their basic text in the matter was the Benedictine Vade Retro Satana, but that was replaced/updated in 1999 with De Exorcismis Et Supplicationibus Quibusdam. Where these books, along with the Malleus Maleficarum, were once extremely rare and access granted only to a very special few and then only under highly extraordinary circumstances, I'm pretty sure that along with everything else you can now find them on the net.
They are very dangerous however. Malleus Maleficarum alone was responsible for the wholesale slaughter of women (in a really gruesome and sadistic manner) in many parts of Europe for a long time, and even the Spanish Inquisition doubted it (and they didn't doubt much at all). And the modern world tends to take a negative attitude toward the labeling of women (and on occasion, but rarely, men) as witches, and frowns upon purifying them with fire, and the use of torture to obtain confessions. And, as I stated above, the most likely outcome of exorcism is death.
The other great danger of these type of works is that in the modern world it's pretty much considered to be a sign of severe mental imbalance to believe any of that, and many of the actions that follow are considered criminal. Any scientific based treatment, like psychology and psychiatry will not help you ward off demons, instead they would treat you for mental health problems (possibly organic in origin, so lots of blood tests would be in order, along wit a CAT scan to make sure you don't have a brain tumor) because you believe in demons in the first place. So you should take great care in this area. Jamie might be all about respecting the beliefs of others in this area, but most people in current Western society are not and consider such beliefs and notions as dangerous.