There are around a thousand inland waterway transporters in Germany today. One of those is the Mnich family of Mannheim. They’re the seventh generation to live - and work - on the water.Their business is transporting grain and feed. They make a decent living of it, even though competition from the big freighters is growing. Torsten, the oldest son, is in training now, and next year he's expected to take the helm.   Report by Julia Henrichmann.