The actor credits his late sister with influencing the humor of his Succession character, Roman Roy.

Kieran Culkinis still navigating the loss of his sister Dakota, over a decade after her sudden death.

“We lived in a tight space where it was just seven of us running around.

Kieran Culkin attends the 27th SCAD Savannah Film Festival on October 28, 2024 in Savannah, Georgia.

Kieran Culkin.Paras Griffin/Getty

It was like a sort of little wolf-pack mentality,” he shared.

He added, That’s how I remember growing up, too.

I couldn’t fall asleep until they all fell asleep.

Kieran Culkin and Macaulay Culkin during “After Ashley” Off-Broadway Premiere - After Party at Link in New York City, New York, United States.

Kieran Culkin and Macaulay Culkin.Bruce Glikas/FilmMagic

Like, I only existed because they did around me."

Paras Griffin/Getty

That tight-knit dynamic made the loss of his sister all the more devastating.

“I only knew who I was because of who my siblings are,” Culkin said.

“So, to lose one was losing a big piece of myself.

Losing one of my favorite people in the world, it doesn’t get easier.

But you get used to it.”

That was her sense of humor, Culkin observed.

That was her."

Culkin and Dakota are two of Kit Culkin and Patricia Brentrups seven children.

Its always going to be devastating.

I still weep about it out of nowhere.

Something funny she did will pop in the head and make me laugh, and then Im weeping.

it’s possible for you to watch Culkins fullCBS Sunday Morningappearance above.