Mohammad Shafia, 58, called the relative — who can't be identified — in late May or early June 2009 and told him he was going to make an excuse to be somewhere near water and then push Zainab, 19, in and let her drown, the relative testified. Court has heard the girls could not swim.
The relative said he called Shafia's wife, Tooba Mohammad Yahya, 41, and told her of Shafia's alleged plans, warning her not to go on any family trips.
The bodies of sisters Zainab, Sahar, 17, and Geeti Shafia, 13, and Rona Amir Mohammad, 50, the other one of their father's two wives, were found inside a submerged car on June 30, 2009, in the Rideau Canal in Kingston, Ont.
The Montreal family was on their way back from a family trip to Niagara Falls.
Their parents — Yahya and Shafia — and the girls' brother Hamed, 20, are on trial for four counts of first-degree murder each in the deaths. They have pleaded not guilty.
The relative testified Tuesday that he was so disturbed by the phone call from Shafia that he hung up on him and called other family members to warn them.
"He told me Zainab, she is a stubborn lady and she doesn't listen to me," the relative quoted Shafia as saying. "She keeps going to library and (on the) Internet ... She doesn't work at home. She goes outside and she has Canadian, other friends and she has contact with them and she has contact with a Pakistani guy and she wants to marry him and these are the reasons I want to kill her. This is against custom and our culture."
On the phone call, Shafia called Zainab "prostitute" and "whore," the relative said.
"This is (an)...ugly word in our culture because no one is allowed to use it against someone else, but especially against your children? No one is using that," the relative testified.
The family is originally from Afghanistan, but they left that country in 1992 and lived in Pakistan, Dubai and Australia before moving to Canada in 2007.
The Crown alleges the four girls and women were killed to preserve the family honour.
The relative suggested that other than Zainab, the only motive to kill the others was simply that they would have talked.
The trial resumed Tuesday morning after abruptly adjourning Thursday because one of the accused, apparently Shafia, was taken to hospital the night before. In court that day, he wept as he watched the video of police interrogating Yahya the day they were arrested.
Minutes after the trial resumed Tuesday with the rest of Yahya's interrogation video, Shafia again buried his head in his hands and appeared to cry.
In the second half of the interrogation video, which the jury watched Tuesday morning, the police officer repeatedly suggests to Yahya that her three daughters and Rona Amir Mohammad were already unconscious before the car they were in plunged into the canal.
The interrogator, RCMP Insp. Shahin Mehdizadeh, who was brought in to conduct the interview in Farsi, asks Yahya several times how none of the four people managed to escape from the car as it slowly moved toward the water, got hung up on the edge of the canal, was allegedly pushed in, then sunk.
"If you think, you are sitting here right now, I push you and throw you into the water, you just sit and do nothing and wait to get drowned?" Mehdizadeh asks. "It's impossible, madam. Even if you sleep on the chair, you will wake up."
Yahya says maybe they were unconscious but asks why the autopsies haven't shown anything. Court has heard the autopsies concluded the causes of death were drowning, but that it couldn't be determined if they drowned in the canal.
Mehdizadeh says there are some substances that don't necessarily show up on tests, but Yahya says she would never poison her children.
The family originally told police that Zainab took the keys when they stopped at a motel in Kingston for the night and must have taken the car for a joy ride that ended tragically.
During the interrogation, Yahya eventually tells Mehdizadeh that she, her husband and her son were in fact there when the car went into the canal, and that Shafia must have done it because she fainted, and her son might have fainted, too.
Yet, Mehdizadeh says, nobody went to the police until the next morning to file a missing persons report, despite at least knowing the car had plunged into the water.
"Is this honour, madam?" Mehdizadeh asks. "Didn't you do anything for them? Nobody did anything to stop them? Four people died and everybody just watched them. Everybody just fainted."
Mehdizadeh shows Yahya cellphone records that he says indicate Sahar was on her cellphone non-stop for most of the trip, then after they stopped at a McDonald's near Ajax, Ont., the cellphone activity abruptly ends.