Gunasekaran, a road worker of the department, and his son Tamizh, a class X student of Government Higher Secondary School at Polavakalipalayam, appeared as private and regular candidate respectively in this year's SSLC examination, results of which were declared yesterday.
The father passed with 234 marks out of 500 while his son secured 459 marks, officials said.
Gunasekaran, a middle school drop out, said he had cleared the eighth standard examination also as a private candidate a few years ago.