Me and my family (5 person), arriving at 01.00 AM at Shanghai Pudong Airport.

You can take metro line 2 to Century Avenue first, and turn transfer metro line 6 to Wulian Road Station directly. The ticket fare is CNY7/person. As I know, you may keep one of your children in your hug when you take the taxi. You may confirm this with the staff when you arrive there. The taxi fare may be CNY130-150 in the day time.