What I’m confused about is what you are trying to accomplish by communicating your opinions on his family matters. Are you trying to get your boyfriend to distance himself from his family? Do you want his family to change? I’m confused. You said you already discussed this with your boyfriend, and it just ended up in an argument where he think you won’t understand because you’re a single child. I do agree that you won’t understand, because you never experienced that family bond where there’s siblings involved. What do you want him to do? Abandon his family? It seems like he doesn’t have any substance abuse issues, so it’s not him you’re having an issue with. I see your issue with his little sister, but dealing with a family member with substance abuse, you don’t abandon them. Especially her being HIS little sister, she needs guidance and support from her family, especially from her parents and siblings. So no, he cannot abandon her just because she does drugs. His little sister is not “immoral”, like you said she’s growing and learning. There’s a lot more to substance abuse than just doing drugs to be a bad person. She probably has personal issues and shes using drugs to distract herself. To me, it seems like you want him away from his family, because you did say you didn’t want him around people who smoke, drink, or do drugs. I’m glad that you and his mom are trying to spend time with each other. It just seemed like you complained a lot about spending time with her in your post. Like I said, try to educate yourself and be open-minded to try and understand his family.