My youngest sister is about to start her senior year of high school.  I'm so proud of everything she has accomplished.
Oh that's awesome! I am an only child but I bet it's so cool to watch your siblings grow up like that.
Yeah, she's adopted and has been with the family for 14 years now.  I always try and help her study when I get the chance, and I'm excited for this new stage of her life.
That is amazing and so nice of you!