It wasn't as if Miya was supposed to remember her right? She was just a few months old when she left. But even that young she could feel a shift in the presence of her house. Her mother was fine the first month or two after, giving Miya food and water, and comfort. Months later, Miya didn't have these things, and when Miya would cry over an unchanged diaper, her mother would just go sit in the room and act like it was fine.
It was all fine right?
It wasn't like her father searched day and night for Coco to come back, right? And when he came back home days later, and drowned his fears in alcohol, that was fine too? At what point was the line drawn and it wasn't all fine anymore?
Apparently two years. That's how long it took until Miya's grandparents decided to get the court involved and claim full custody.
The court case wasn't that interesting. Her parents didn't fight on her behalf, they were worried about her "missing" sister, which didn't do so well on their side.
Miya has lived her next 16 years with her grandparents, not missing her parents too much, and not knowing about her sister. Well, at least not until her eighteenth birthday.