TIFU by telling my brother-in-law his d*ck was discussed at the dinner table

We went back home for a few days with my sister. We had this big lunch with the whole extended family and all. Everyone was drinking and having fun until I caught my aunt and sister talking. My sister was complaining that her husband wears 15(48 eu) size shoes and she cannot find the sneakers he wants anywhere so big. My aunt (drunk as hell) goes-‘ oh, is the rumor true? Big feet big socks, eh?’ My sister mortified, tries to change subjects but my aunt is relentless. I can see grandma frowning at the two of them and my little cousins making curious faces. My sister finally had enough (it was over 20 minutes that our aunt insisted to know) leaned in and whispered ‘yes’ and then excused herself from the table. I made a face because I am close with my sister and my brother-in-law and I meet them almost every week for dinner or coffee. I had thought that my father hadn’t heard because he had been watching the game but suddenly he turns to me and goes-“ what you making faces for? I told your sister, basketball players jump high and slam deep!” I only heard his laugh as I screeched and left the table to go puke a bit in my mouth. I told this story to my brother- in-law today because I found it funny once I recovered but now he says he refuses to attend family gatherings.

TL;DR My sister is mad at me for telling her husband my family was being noisy about him.