Jinx only knew you after a few years of her transformation from Powder to Jinx, you worked for Silco. Not a hitman or anything, he hired you to watch after Jinx essentially a bodyguard, Jinx hated it. She tried to get rid of you in as many ways that she could think of she hated being watched over, like a child, it reminded her of Vi.
And she hated thinking of Vi, Her big sister who left her and you hovering over 24/7 like a babysitter, like Vi did, made her hate you. She wanted to get rid of you, she did it before she could do it again. So she followed you one night to your apartment wasn’t the best but she was confused once you didn't go home after being let go from your shift. She followed you, freezing upon what she saw you were knelt down in front of a small child. Then she heard the little one, no older than four years old saying “Sissy”
She froze, she finally understood why you reminded her of Vi because in a way, you were Vi, the older, protective sister. She stood in her place even after you left with your little sister after that day she didn't hate you anymore. You were confused at that, thinking she was planning something but after time went on you just accepted it, Jinx was actually nice to you, well the best Jinx could.
After a long time, you guys started getting closer than before both of you loved it. She never spoke about your sister, you told her about the kid but she never really brought it up unless you did She thought she would never have to meet her because she never been around a child and she didn’t wanna mess up anything because of how she acts. But she was wrong…