You should not get involved with your family's love life.
Phil's sister has started dating a man that Phil does not trust.
Phil wants his sister to know he cares about her.
Phil tells his sister he cares for her deeply and that he is there for her if she needs advice.
Phil tells his sister he thinks her new boyfriend is not good for her.
Phil's sister feels supported and safe.
Phil's sister stops seeing her boyfriend and is very sad about it.