Is NOBODY wrong in the post ? POST : So I was wanting to introduce my new girlfriend to my parents and my sister! Now I was going to make dinner for the 5 of us. My sister has a fiancé and he is something..(no filter,cocky, and a big baby) well i didn’t invite him over and he is upset and my sister is also. And he is starting to fight with her and my sister is heated at me now. 

So should I have invited him over or was it my decision to either introduce him later? 