Elena not picking up call

Jack was very disturbed since morning so he didn't go out today for the evening walk in the park. He was sitting in his room.

" Jack.. " his mom knocked the door.

He got up from his bed and opened the door.

" Yes mom. You want something? " Jack said.

" No. I just came to call you to come in the living room for the coffee. Spend some time with us. You're closed inside your room since many hours." his mom said.

" Okay. I'm coming. " he said.

Jack went to living room. His dad and sister were there, having their snacks and coffee. Jack went and sat there on the chair near his dad. His mom gave him coffee.

" Jack, did you find who had sent that boy in our house? " his dad said.

" No dad, not yet." Jack said after taking a sip of coffee, " Can't we get any information from the phone  which we got from his room? "

" There is nothing in that phone. I already checked it. Everything had already been deleted from the phone. "