Liz Humphreys and her family are going through reverse culture shock after returning to New York from Berlin.JF GrossenLiz Humphreys moved to Europe with her husband and raised her son in Berlin until he was 6.After moving back to New York, she was surprised by all of the rules surrounding kids.She has found that there are advantages to raising children in both cities.My three-year-old son was busy flattening his piece of clay into a pancake when another ball of clay came flying through the air.