Have you ever felt bad for a family member who died before your birth?

Hello everyone have you every felt bad for a family member who died when you were young. My parents told me about a cousin of mine, who loved me alot when I was one. She died two days after I left my home country because of a doctor who gave the wrong medicine . Now I feel terrible and pissed at the same time. Terrible at the fact that she loved me (one year old at the time parents told me she was the last person I kissed before she died the next day) and I barely remember her or go to her death anniversary. And I was mostly pampered while she died alone. At the same time I feel angry that it was a doctor who killed her. Wrong medicine! (we lived in a third world country no one was jailed or anything). Have you had those feelings and if so how do u deal with it? Honestly I am atheist but I hope god treated her well or reincarnated her. She was only 16!