Trust me i know all too well kidney disease runs in my family.
When I was younger my fav aunt needed a kidney, her own lil sister was like nope (they didn't have the best relationship, also she's a hater) had a cousin who was also a match and he ended up being her donor. She died 2 years later from kidney failure. almost 20 years later he suffered kidney failure and passed. That was 6 years ago and my other aunt has yet to shut the fuck up about how right she was about not giving her kidney..."See I told you..." like lady pleaseπ
With the risks that come with giving up one kidney esp if Kay wants to have kids and being a BW the higher risk of HTN and preclamspia why should Kat put herself and her future at risk to save a siz who has never being a sister towards her