Should a bf not get involve with gf family affairs?
Stay out of it man. You’re not married to her yet, you’re not a part of the family, and really the family’s problems are not your problems, they’re hers. Where you come in to the picture is the emotional well-being of your girlfriend. The best thing you can do is not ask too many questions, just be there for her, affirm her feelings, and keep your head down. This isn’t a situation you can help fix, and your girlfriend doesn’t want you to “fix” the source of her emotional distress, all she wants is for you to show her you love her and care about her and comfort her when she’s upset. When a girl is upset, she doesn’t want to fix the cause of the problem, she wants to express her emotions…I know, it doesn’t make sense to us guys, and it never will, but that’s just the way most women are. We can’t change them, we can only love them. P.S. Apologizing to her sister would go a long way in making sure the family doesn’t start to view you as part of the problem, and will make life a lot easie