I would advise you to seek therapy for your issues. You are intrusive and bizarrely over involved in your adult sons life. Nothing you have posted indicates he is in need of anything more than a restraining order that would prevent you from harassing him.
Take all your evidence to the cyber crime division of your police department and speak to a detective there. If you live in a small city/town and the local police don't have a CCD try the State Police.
You're brother should ask his attorney any questions he may have. this is his case...not yours. The attorney works for your brother even though you may have paid the fees. You don't have the right to fire the attorney as you are not the client.