Haruka Koide Natsuko Kayama Daughter In Law And Mother [NEW]

I know Haruka Koide is a Japanese singer. She was part of a group called STU48's 2nd Generation. And Natsuko Kayama... Maybe she's a mother or a relative of Haruka? Wait, the user mentioned "Daughter In Law And Mother". Could Natsuko Kayama be Haruka's mother-in-law? But I don't remember any public information about Haruka being married. Maybe the user is mixing up names or there's some confusion.