history: When I was 15, my family adopted a little sister.  She's just about to start her last year of high school, and it's been really cool to see her grow up into a young woman.
current: My youngest sister is about to start her senior year of high school.  I'm so proud of everything she has accomplished.
next: Oh that's awesome! I am an only child but I bet it's so cool to watch your siblings grow up like that.