A beloved classic TV star is asking for prayers for his family. On Dec. 11, actor Bill Mumy, who is best known for his role as Will Robinson on the 1960s sci-fi series Lost in Space, posted to Instagram to ask fans to send support for his daughter-in-law, Alexa Cline Mumy. Alexa is the wife of Mumy’s son Seth, 36.
Mumy, 71, captioned two photos of his daughter-in-law with a heartfelt request for his social media followers.
“FAVOR PLEASE, folks,” Mumy wrote. “I’m asking for prayers, good thoughts and positive energy sent to my wonderful Daughter-in-Law, Alexa. She’s having open heart surgery tomorrow morning, and all your support will be very much appreciated. Thank you kindly. ✌️❤️🙏🏻.”
Mumy received a big response from fans all over the world as they showered him with support in the comment section.
“Sending positive thoughts and healing prayers to Alexa 🙏💙,” one fan wrote.
“Hey Billy, sending prayers and good thoughts to Alexa from Australia ❤️🙏,” added another.
“Many prayers sent for sweet Alexa. 🙏💜🙏💜,” a third fan wrote to the actor and musician.
“Throughout your career you’ve been there for your fans. Now of course we’re all here for you, your family, and Alexa,” another wrote to Mumy.
Legendary Olympic skater Tai Babilonia also responded to the post, writing, “Prayers up 🙏🏽💪🏽.”
In July, Mumy posted to Instagram to mark Alexa’s wedding anniversary with his son. “Happy 9th Anniversary to Seth & Alexa Mumy! 🥰,” he captioned a photo from the couple’s 2016 wedding day.
He has also shared photos of the couple’s young children. In 2024, Mumy posted a birthday message to his son, which included photos of his wife, Alexa, and their kids. “Happy 35th Birthday to my son, Seth Davis Mumy,” the actor wrote. “He makes me proud. Seth is a wonderful father, husband, brother, son, friend and attorney. He works hard and is truly loved. Time is a bizarre river! Seems like he was just a little boy! Onward. 👍👍🙏🏻❤️”
Bill Mumy married Eileen Joy Davis in 1986. After the birth of their son Seth in 1989, they welcomed a daughter, Liliana, five years later.
In an interview with Rock Cellar, Mumy was asked to recall a significant moment in his life, and he responded with a family memory. “For a personal moment, I’ll say when my daughter Liliana was born,” he shared. “My son Seth was so happy to have a sister.”
This story was originally published by Parade on Dec 12, 2025, where it first appeared in the Entertainment section. Add Parade as a Preferred Source by clicking here.