Krystyna, I am so sorry about your Aunt. Before I retired and was working for Local Gov, I was for a short stint office manager for local Shelter. The local shelter should pick up the cats and get the ones they can healthy as possible and put them up for adoption. We used to Foster Cats that were either Preggers or Sick until they were ready to adopt, and I was lucky if one of the kids did not want to adopt.
We will be praying for your Aunt, and for your family to help them deal with all the issues involved!