My grandfather, murdered all of my aunts and uncles on my moms side, and was also convicted of attempted murder on my mom and grandma. I can only speak for our family, but we have actually tried to not forget him, when I was pretty young my mom had the talk with me about him. Like how PTSD effected him, how to live through tragedies. When my kids are old enough, I still have the news paper clippings and things from my grandmother, and I’ll talk to them too.