The two grandchildren of a German restaurant entrepreneur have been returned to their father in Denmark after being abducted on New Year’s Eve, Danish police said on Saturday. A custody battle over the two children of Christina Block, the daughter of the founder of the German restaurant chain Block House, and her former husband is ongoing. The police are in close contact with the family to ensure the safety and well-being of the 10-year-old boy and the 13-year-old girl, the officials added. They continue their investigation into assault and deprivation of liberty after the dramatic events of N…