A man in Pontiac, Michigan, walked in on an unexpected sight as he caught his father-in-law with his wife, the man’s own daughter. From that point, an altercation took place in which the older man ended up stabbing the wife’s husband.

According to CBS Detroit, a 25-year-old man arrived home around 3:30 a.m. on Saturday night. That was when he saw his wife and her father totally nude, and laying together in bed. Upon seeing this, the man woke up his father-in-law and they got into a fight, which spilled outside the home.

While the fight was going on, 47-year-old Henry Allen Michael allegedly stabbed the young man in the back with a knife. Michael then left the scene by getting into his son-in-law’s vehicle and fleeing.

The younger man went to McLaren Hospital to be treated for his injuries after the stabbing, and that was when police arrived. They noticed he had a possibly perforated right lung, but the stabbing injury was non-life threatening.

The victim was interviewed, and police tracked down his wife. Fox 8 reports that the 24-year-old woman said she was out drinking with her father and passed out upon arriving back at home. She knows nothing of what happened until her husband woke up her and her father.

Police were told by the woman that she believes she was sexually assaulted, and this led to her being examined by staff at the hospital. Further examination was done at the Haven START Program and she was then driven to the home of a relative.

The woman’s father, Henry Allen Michael, was later arrested by police and is currently in the Oakland County Jail on pending charges. Michael had been staying at the home of his daughter and son-in-law since being released from prison.

Michael did have an outstanding warrant on him for a probation violation at the time of the stabbing. He also has a long criminal history, which includes robbery and assault with a dangerous weapon.

Henry Allen Michael was sentenced to 20 years in prison in 1992 for robbery, and was released in 2012.

An investigation is ongoing by police in Pontiac, Michigan, as to what exactly transpired between Henry Allen Michael, his daughter, and her husband. The stabbing is going to lead to at least one charge, but police state there could be further charges against Michael depending on results from his daughter’s hospital examinations.

[Image via Oakland County Sheriff’s Office / Getty Images – Larry W. Smith]