You didn't cause this. You can't control it. You can influence it.
Al-Anon's "Three Cs", you didn't Cause it, you can't Control it, you can't Cure it, are clinically accurate and important for family members to internalise. Addiction is not caused by parenting failures, relationship problems, or family dynamics, though these things can be risk factors.
But the Three Cs omit something important: you can influence it. The CRAFT research is clear that family members with specific skills produce significantly higher treatment engagement rates than those without. The research on expressed emotion shows that family members' communication styles affect treatment outcomes. You matter. Your approach matters. You're not powerless, you're a significant part of the recovery environment.
Use the Accountability Partner Tracker to stay connected to your loved one's recovery journey. Review the Relapse Prevention Plan Builder together during a calm moment to build a plan before it's needed. And please, use the Crisis Hotline Directory for yourself as much as for them. You need support too.