Gregson Wagner, 49, is the daughter ofNatalie Woodand her second husband, Richard Gregson. (She refers to Gregson and Wagner as her two dads and calls the latter “Daddy Wagner.”)

To mark Wagner’s 90th birthday on February 10, Natasha writes, “My sisters and I did not know what to give my Dad for his 90th birthday. What in the world do you give a 90 year old? Katie (Wagner’s daughter with second wife Marion Marshall) had the great idea of having her dear friend and pretty rad photographer Greg Gorman take a picture of us.”

“Then we figured why not have Dad and Jill in the photo too,” she adds, referring to Wagner and wife, Jill St. John, whom he married in 1990.

Globe Photos/Shutterstock

NATALIE WOOD WITH ROBERT WAGNER AND NATASHA GREGSON WAGNER

In the photo, Natasha poses with her daughter, Clover, Jill St. John, Wagner, Katie Wagner, her son, Riley, and her sister Courtney Wagner.

As she writes, “Hope we all get to age as gracefully and joyfully as our dad.”

Natalie Wood.Silver Screen Collection/Getty

Natalie Wood

As she told PEOPLE in 2016, “I grew up always thinking I had two dads. I’m certain because my mom died, my relationship with my stepdad is way deeper than it would have been had she lived, because he had to be my mom and dad.”

Natasha is currently working on two projects that honor their mother, the legendary movie star known for her roles inWest Side Story,Splendor in the GrassandRebel Without a Cause, among others.

She’s written an upcoming book,More Than Love, to be published this May, in which she tells her story and her mother’s story — in depth for the first time. In conjunction, she’s collaborated on an HBO documentaryWhat Remains Behind.

source: people.com