Tension between a father and his adult son in the family’s home at 1429 Grampian Blvd. had existed “for the past few weeks,” but when the son was “disrespectful” to his father’s wife, the couple decided on the morning of Nov. 21 “to kick the son out of the residence,” according to a state police affidavit that became public this week.

The father went down to a basement bedroom and confronted his son, police said. The son’s girlfriend, who also was in the house, followed the father into the bedroom, police added.

“A verbal altercation took place between the father and son. Both were threatening each other. After the father pushed his son and the girlfriend onto a bed, the son stabbed his father,” police alleged in the court document.

“The father then shot the girlfriend and the son,” Trooper Brian Siebrert wrote in the affidavit that was part of a search warrant investigators filed at the office of District Judge William Solomon said.

The Sun-Gazette is not publishing the names of those involved since no charges have yet been filed as the investigation is ongoing.

All three people were taken to UPMC Williamsport by ambulances for treatment for their injuries, police said.

The father suffered “a stab wound to the lower left abdomen near his rib cage” while his son “had a gunshot wound to his left hand and abdomen,” police said in the court document. The girlfriend “had a gunshot wound to her right abdomen and an exit wound to her back,” it was stated in the affidavit.

When questioned at the hospital by a trooper, the son said his father entered his bedroom, “pulled out a handgun and began harassing and threatening him,” the court document stated. The son admitted he pulled out a knife and stabbed his father, who in turn shot him and the girlfriend, police said.

When troopers arrived at the house, just east of the city-Loyalsock Township line, they saw a handgun “at the entranceway with a live bullet and a magazine with five bullets” next to the weapon, police said.

“There were bloodstains on the front entrance mat and a living room coffee table,” police said, adding that in the basement, bloodstains also were on the carpet as well as the blade of a pocketknife that was on a bed.

Troopers seized two handguns, a knife, an empty shell casing as well as other items from the home, court records.