I'm adding an "ecchi" tag because this needs some content warning, and the broad intent seems plausibly gratuitous along those lines along with whatever else it is (to the extent that the author's intent can be discerned at all).
@XxxARTSxxX The reason might be the other kids. There were other kids also in background so I think the mother thought she was pointing to some other child. But my argument isn't sound since at end when they were in closet Yuki was called and not Aya.