My sister has a younger sister, who is heavier, but her younger sister is lighter. . .. for this lyric song. . This is a series of ending songs. . Very old TV series. Singing by a female voice.

Lyrics:

There is a seesaw in my heart. I sit at one end and you sit at the other. There is a seesaw in my heart. I sit at one end and you sit at the other. Your sister's heart is as heavy as your sister's body and your heart is as low as your brother's body. I want to keep my true feelings for life, but I don't want to get up. My sister's heart is as heavy as your sister's body, and your heart is as low as your body. I want to spend the rest of my life keeping my true feelings. I miss you when you get up, and I want to spend the rest of my life with you. You miss me when I get up. When you get up, I miss you. I want to be with you all my life. There are always ups and downs of interest. ...