Is the sentiment reflected in the input text negative?

Input: Sisterly love: After beating older sis Venus in 3rd set match at @user Serena says, "She's the best person I know." (Cc:@alexa_pollock)
Sisterly love: After beating older sis Venus in 3rd set match at @user Serena says, "She's the best person I know." (Cc:@alexa_pollock)