Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Barbie's much younger "younger sister" Kelly

It's true that Barbie and Ken were never married, but those correcting others here about Barbie's relationship with Kelly need to open their eyes. Are we so gullible that we're going to believe Barbie that Kelly is her sister? Barbie dates to an era where it was not uncommon for an unwed pregnant girl to be shipped of to "stay with her aunt" for a year, then after her return she would conveniently gain a "baby sister". Marlon Brando went most of his life call his grandmother "mom" and his mother "sis"; google it for the details. The images and text accompanying the set of Barbie pushing Kelly in a stroller makes it clear what their true relationship is.