Thrid person
Matsuda left the girl with the yagami family knowing he could trust them and knowing little (y/n) would not make a mess. Light left the two girls alone for them to sleep the girls change and went to sleep. As the two girls slept a figure was by the window. It was a shadow (haha you thought it was your mum).
Time skip
The girls woke up and Sayu took (y/n) to the kitchen to eat. (Y/n) saw that miss yagami was needing help cleaning up the child helped her wash the dishes like she would do with the maids in her house , and finished.
Matsuda came to pick his niece they said there thank you to the yagami. And they went home