My cousin is dating her sister's boyfriend???

Date: 4/14/2018

The first part of my dream I remember my dad was going to meet my cousin's boyfriend but in my dream mind he looked different and had a different name Andrew than in reality. But when we got in front of my aunt's house she and her sister's boyfriend (or technically fiancé) were coming toward us and I was thinking, what" happened to Andrew", for some reason not even really confused that this was her sister's fiancé and my dad was disappointed. He recognized him and said something like "oh she's still with him?" And I was trying to say "no, she met someone else. He was supposed to be here." What's weird is irl my cousin was in a long term relationship for almost a decade with a guy a lot older than her. It was very unhealthy and we all hated him. Now she's in a much better relationship with someone more her age and we all love him and my cousin is extremely happy. But now her sister who is in a "relationship" and technically "engaged" is in a very unhealthy relationship. He literally never comes around and they both lived with his mother and there was some drama that went on with that. Basically as the landlord she gave my cousin, and her son frankly, horrible living conditions for which she still expected rent payment and then my cousin got kicked out and they had to go to court and she's just a psycho but in the end her fiancé chose his mother over her and what's sad is my cousin is still in love with him. So I'm not sure how I managed in my dream brain to conjure up the idea that my cousin would be dating her sister's fiancé but I think it had to do with how they've both been in unhealthy relationships.