A 62-year-old customs officer, his wife and two children were arrested on Friday in Kilkis, northern Greece, for smuggling alcohol.
The arrests came after authorities caught the manís 33-year-old son carrying contraband drinks in his motherís car.
It emerged that he had bought them in the Former Yugoslav Republic of Macedonia (FYROM) and had brought them into Greece while his father was on duty at the customs point on the border.
The 33-year-oldís mother and sister were traveling in a car some distance ahead of him so they could warn him of any police checks, officers said.
The suspect was allegedly aiming to sell the drinks at liquor stores owned by himself and his mother.