My Son Shahwaiz Disappeared But He is Not My Son A Horror True Incident

A Horror True Incident Once, I was Alone in my House at Night

Shahwaiz is my son. When my son was in 9th grade, he was very intelligent. One day, I had a high fever, and I was lying on the couch. While I was lying there, my husband checked my temperature. At that moment, he went to the market to buy some items. As it was night time, my son, Shahwaiz, sat next to me and talked to me. That day, he talked a lot.
There was no one in the house except us. Suddenly, my son Shahwaiz walked out of the room. Now it was too late. He did not return. I was lying in bed.
Shahwaiz, Are you okay?
He didn’t reply. I turned my head, and I looked outside. Shahwaiz stood behind the wall, watching me. It amazed me that he was doing such strange things while he was so intelligent. He would hide sometimes, and sometimes he would glance at me, then he would go somewhere because I was feeling poorly, so I had difficulty getting up from the bed to see where Shahwaiz was going.
I searched him all over the house, but he was not be found. When I came to the main door of the house looking for him, suddenly the door bell started ringing because my husband was back to home, and surprisingly, Shahwaiz was with him.
I was terrified because if Shahwaiz had gone out with his father, then who was the one who was with me in the house and was talked to me a lot and after  went to other room, secretly watching me and then disappeared somewhere.
Even today, I am scared to think who he was?