My family is all against me.

So my cousin was at my house last night and my boyfriend was so mad at my roommate that my brother thought instead of letting him fight her boyfriend he would give him a beer. My cousin got mad that he didn't give them one and so he went home mad and I get a message from my cousins sister about how my brother wants to fight my cousin and whatever and its not that they have ALWAYS play fought and o told her that and then she went on to say how I claim I'm pregnant and I drank a glass of wine (please don't judge me I was so stressed out last night its the first glass I've had since about november and I only took 2 sips before I realized what I did) and so she was coming at me about that and she said that we just use my cousin and we don't care about him and we should just stay away from him and the family when in reality my cousin is always asking my boyfriend for money or something else or a ride. One time they gave him $2 for gas when they said they would give him gas money. I'm so tired and fed up.my aunt wants us to come over and talk about it but my cousin said some real messed up hurtful things and she was the second person to tell me to stay away from my family the first being my father. What should I do?