A man was on sunday evening found by his father making love to his step mother at Chironge village, Kisii County.
His father, Lucas Mokua furiously cut the hand of the son only identified as Musa before pouring acid on his face.
The man then opted to go into hiding after realising that he had done a mistake.
Locals say, Musa and the step mother, Angela went to the same High School and were lovers at some point in life.
Angela was married late last year by Mokua as the fourth and last wife.
It is said that Musa and Angela could even at other nights sleep together when Mr Mokua was away or in the houses of his other wives.
Residents say, Mokua arrived at his home and dashed to his bedroom and when he entered he found the two love birds having good time.
Mokua then took a machete and cut his son on the hand.
In his defend, the son said that his father went ahead and married Angela yet he was aware that they were dating.
This made him to undergo psychological torture as most of his friends laughed at him.
Police have launched investigations into the matter and want anyone who knows the whereabouts of the Mokua to report to the nearest police station.
To be the first to get updates on breaking and trending news in Kenya, send your WhatsApp number to 0740950003
####Kisiitalk