I have ancestors who were Jewish, though not myself. Six of whom died in the Holocaust.
When I found this out a few years ago, the death that most affected me was that of Maurice, cousin of my mum. He was in Auschwitz up until six days before the liberation, at which point he was moved to Buchenwald. Unlike the other five, he has not a date of death so no precise anniversary to remember him, though he is remembered in the Shoah Memorial in Paris.
I am able to remember him and the other five ancestors, perhaps we should think of those who have no one to remember them.