Former Seattle Councilwoman Cheryl Chow is featured in an ad supporting gay marriage in Washington state.

Chow, 66, only recently publicly acknowledged her sexual orientation. She and her partner of 10 years, Sarah Morningstar, are raising 4-year-old Liliana. Chow, who is suffering from terminal brain cancer, said she embarked on “her last crusade” to help LGBT youth.

“Parents and kids, don't be afraid of saying that you're gay,” she told King 5 News. “I was afraid for over 60 years and those 60 years are wasted.”

In the ad, Morningstar's mother, Chris Morningstar, discusses the couple's relationship.

“I'm so proud of my daughter Sarah,” Morningstar says in the 30-second ad. “She and her partner, Cheryl, are just wonderful parents. When Cheryl was diagnosed with brain cancer, my heart just went out to all of them. It really hurts watching them fight this cancer. And what's just as hard is watching what they've had to go through because they're not legally married.”

“One night in the hospital, Cheryl had a seizure. She was asking for Sarah and no one called.”

“Only marriage guarantees all couples can be there for each other when it really matters,” she adds. (The video is embedded on this page. Visit our video library for more videos.)

Voters in November will decide to either uphold or repeal a gay marriage law approved by lawmakers.

(Related: Washington gay marriage support holds 18-point lead.)