Yesterday, I was alone in my house studying in my room.My family went on vacation for a week. And I heard a sudden noise from downstairs.I thought It was a cat but later I heard my mom voice.So I thought they return to home.I was continued hearing my mom voice from downstairs calling me to come down.I was about to go down but suddenly I got a call from my mom.I was so confused at that time because she is in my house and why is she calling on the phone.Anyway I picked up and she said they were having fun in their trip and told me to sleep early.So who is the woman in my mom voice from downstaris?