United Kingdom, June 30 -- Kristin Cavallari has not spoken to her father for three years because he allegedly "traumatized" her children.

The 38-year-old reality TV star decided to cut her dad Dennis Cavallari out of her life in the wake of an incident where his behaviour was "crossed the line" with one of her sons.

Kristin - who has two sons, Camden, 12, and Jaxon, 10, and nine-year-old daughter Saylor with her ex-husband Jay Cutler - insists Dennis took "zero accountability" for his actions and so it became an easy decision for her to simply cease having a relationship with him.

Appearing on Harry Jowsey's podcast Boyfriend Material, she said: "I always had a rough relationship with my dad.

"That's a deal breaker for me, especially...