My future sister in law's father was killed in a car accident last night, she asked me for advice?

NO Mija it isn't a time to remember the bad that a person has done in his life but a time to forgive and heal yourself. First off...go to GOD before any of us here and he will lead your heart in the right direction. If she feels like family then she is family and you and your family should be there for her and your brother...( I know that you will anyway). GOD bless and I will pray for your family, J.C.