How much and where to get a taxi from pudong airport to hangqiao train station

If by taxi, it would cost around CNY230 in daytimes and CNY290 at night. Official taxi stands are available at both T1 and T2. You can follow the signages to find that. If you take a cab outside the airport, the will charge much higher.

Generally, it is allowed to accommodate at most four passengers in a taxi. As you have two kids, you can negotiate with the driver to hold you all.