Henry Diltz/Corbis via Getty Mama Cass’ daughter Owen Elliot-Kugell is opening up about her experience with the pop group Wilson Phillips in her upcoming book and a new conversation with PEOPLE.

Owen wrote about the now-infamous ham sandwich rumor in her new memoir, entitled My Mama, Cass, and she described ... bombarding her and her family at the funeral, even going as far as to push ...

"They made quite a few really great records. It just wasn't the right combination," Owen Elliot-Kugell exclusively tells PEOPLE Mama Cass' daughter Owen Elliot-Kugell came up with the idea for ...