Excuse me for not understanding what it is you want. I can tell you what I know of my mother, you can decide what if anything you want to share with Katie.
Cozette abandoned me when I was 8 months old, from there I was placed in foster care. She gained custody of me twice, both times she abandoned me again. I know that she was not Mexican but Mediteranian (from where I do not know-Italy maybe). I know this because I have a blood disorder that primarily affects those of Mediterranean decent(Thalassemia). I'm also quite sure that Jessie Inzunza is not my father.
I have no love for my mother and hold her responsible for who I am today. Due to abuse of every kind in foster care system I live with severe depression and anxiety which I am on medication to keep me functional. Today I am unmarried, no children of my own and have nothing aside from my children to show for in my life. She has several brothers out there that were adopted as she was. I have contact with none of them.
There's nothing in my mind that your grand daughter needs to know about any of us(meaning my absent family, not her brothers). She needs only know that I love her and wanted to give her the best chance in life.
I hope this has answered your question for you.