<human>: Condense the text into a few key points

So I went to a party and got drunk. I spoke to several people at party and then find out a week later that someone told my sister-in-law that I said all of these horrible things about her and her dad (my father-in-law). 
I apologized for her hurt feelings and said there was obviously some confusion because I didn't say those things. I said they must have twisted my words. I offered to meet with her and girl I "said" these things too. She declined and said that she was just hurt. Her brother, someone I really like and respect, thinks I said those things and that "drunken words are sober thoughts" but thinks we should get over it. What else can I do? I feel horrible they think I would say/think such things about my husbands family.
<bot>: got drunk at a party, someone made up stuff. Sister and brother-in-law think I actually said it. What do I do?