The Jewish member of my family who impressed me the most with her acceptance of me as a Catholic was my great-aunt Pauline. She was sent to Auschwitz in 1943 along with some of my other Jewish relatives. She said that the words she lived by was, "I will not die, even if they kill me". She loathed Christians, especially Catholics and Lutherans, because they were the ones who had put her in that hellhole.  

Yet, she accepted me and my brothers as members of the family. She welcomed us to her home and taught us to appreciate Jewish traditions. When I was confirmed, her gift to me was a mezuzah, which is attached by my front door.

I suspect, though this is only a suspicion, that she felt the family had lost too many in the Holocaust, and she was not going to turn away any member of the family.