(PHOTO) To punish her husband wife kills their two daughters

A Texas woman fatally shot by police after killing her two daughters told her husband, “This is about punishing you,” .

A family friend of Taylor and Madison Sheats and their parents Christy and Jason Sheats told KTRK-TV on Tuesday that the shooting Friday evening at a suburban Houston home followed one of the couple’s frequent arguments.

Police said an officer fatally shot longtime gun rights advocate Christy Sheats, 42, after cops rushed to the Katy home to find her shooting at one of her daughters in the street. The argument between the women’s parents turned deadly on their father’s birthday, the family friend, Madison Davey told the TV station.

“He told Christy, ‘Just shoot yourself. Make it easy on all of us, just shoot yourself,’ and she said, ‘No, that’s not what this is about, this is about punishing you,’” Davey said. “I always knew something would happen. I never thought she would do this. Christy was toxic for the family. She was mentally unstable.”

The “completely off-the-wall emotional” mom once spent time in a mental institution, Davey said.

On Friday, she hid the gun under a couch and brought it out to fire on her own daughters at a family meeting she demanded because her husband refused to apologize for the argument, she said.

He would do anything to protect them and he tried to, but Christy was out to kill that day,” Davey said.