"We've been talking so much about sibling relationships and distraught relationships or good relations and we're sitting here like we have the best family, like we're so great. And yet, we don't ever acknowledge the fact that we have four other siblings," the Almost Famous star explained to her older brother. "So I've been thinking about the Hudsons. Thinking it's important that we reach out with all of our siblings and maybe connect with them a little bit."
Kate and Oliver are the children of Goldie Hawn and her ex-husband, singer and actor Bill Hudson. The siblings were raised by Goldie and her longtime partner Kurt Russell. Goldie and Kurt are also parents to Ingrid Goes West star Wyatt Russell and Russell is dad to Boston Russell with ex Season Hubley.
Following his split from Goldie, Bill went on to father Zachary and Emily Hudson with Laverne and Shirley actress Cindy Williams. He also had a daughter with long-term girlfriend Lalania Hudson. It's unclear who the fourth child Kate referred to in the podcast is.
While Kate and Oliver are close with the Russell side of the family, they have had a much more contentious relationship with their biological father.
In 2015, after Oliver posted a photo of Bill on Instagram on Father's Day with the caption "happy abandonment day."
In reaction to the post, Bill told The Daily Mail in 2015 he was done with his kids from his previous marriage. "I say to them now, ‘I set you free,'" he explained to the outlet at the time. "I had five birth children but I now consider myself a father of three. I no longer recognize Oliver and Kate as my own. I would ask them to stop using the Hudson name. They are no longer a part of my life."
Despite their strained relationship, it seems that Oliver and Bill have attempted to mend things—in part due to the Scream Queens actor's intense Instagram post.
"There was an incident that happened via my Instagram. I had posted something that was darkly comedic and it blew up into something, and actually it helped us with our relationship," Oliver explained on Larry King Now in 2018. "So, now we're kind of keeping in touch."