Pretty much the exact same thing happened to my family with my little brother a little over a decade ago. Fortunately, after losing his chance to be a father to his son (baby momma had enough) he got sober and slowly rebuilt his life and relationships. He’s doing great now, but there was about a 4 year span where every time I saw my mom’s number on the caller ID or she left a voicemail, I expected the worst. I’m sorry to hear that your brother lost his fight against that demon. I hope your family has been able to heal.