Leaving a four year old home when she is sick

In the first season during the dark masters arc, Tai was upset when Kairi fell ill again and explained why. She was about four or five with a fever and Tai came home and she was the only one there and he took her outside to play ball.

His mom slaps him at the hospital because of it. I think she should have slapped herself. I guess in Japan it's okay to leave a baby home alone. What if Tai didn't come home and Kairi went to the kitchen to get a drink and collapsed on the floor?

Idiot.

Little Mikey Myers that lived across the street.