(Disclaimer: I do not own characters from Brooklyn Nine-Nine) So do you remember when Jake screwed over Dr. Rossi in season 1 episode 4, M.E Time. Yeah well he kind of got her TiVo (yes that is a friends reference in a Brooklyn 99 fanfic.) In other words he got her pregnant. She didn't want anything to do with the kid and made sure her name wasn't on her birth certificate or had any connection to her after Lucy Andrea Peralta was born. Jake tried to convince Rossi to just split custody, so Lucy didn't have to grow up without a parent like he had to. But she declined, more like told him to "f*ck off", but that's practically the same thing. Lucy has Jake's brown hair and brown eyes and his personality, but she also gets in trouble a lot. Also, yes he named her after Lucy Gennaro McClane from Die Hard.