Cruise with two embarkations

[rlk]

We are sailing in the Baltics on the NCL Getaway this summer. I have two teen boys, ages 15 & 16, who are on the quiet side. We went on one cruise prior to this one and my kids made the mistake of not going to the teen club on the first night. Our cruise this summer has two embarkation ports. The cruise starts in Coppenhagen(1st embarkation) and sails to Warnemunde, Germany the next day for the 2nd embarkation and where we embark. The majority of the passengers embark in Coppenhagen, therefore I am worried my boys will run into the same bonding issue.