Scrovegni Chapel in Padova

I have a few questions about the Scrovegni Chapel tickets: 1. What is the best price (or ticket package) for a family of 4? 2 adults + 2 kids (ages 13 and 11) Padova Card 48 hours
Padova Card + Chapel 2. Are the tickets and the Padova card sent to us by mail or email? Or do you pick them up at the station? 3. Don't we need the Padova card in advance for transportation from the train station? Any help is appreciated!