C1738 What is there to be polite about in a family

"I'll take a call." Yu Tianning took out his cell phone to see if it was his sister Yu Lili's number. "It's my sister's."

"Sis ?" Yu Tianning picked up the phone and called out.

"Tianning, I heard you're taking your girlfriend home today ?" "When will we arrive? We'll be waiting to see." Yu Lili's voice was very excited.

"Yes, we have five minutes. Are you already home? " Yu Tianning asked