The Glee story, where Kurt and Finn have two little sisters, one is 16 years old Rosie and the second one is Leslie who is 4 years old. Rosie lived for 11 years with Finn and Carol and didn't know who her biological father was. Then she discovered it was Burt and that she has another half brother Kurt (first being Finn). After lot of trouble and getting on they finally became a real family. Burt and Carol got married and had their second (or fourth if you will) child together, little Leslie whom everybody adored for her cuteness. Then Finn tragically died, it was a shock for everyone and they're still recovering from that. Also, Rosie is dating Sam Evans. There is also another new character, Grace who is Carl Howell's daughter. Grace is an amazing dancer and Rosie's best friend, both of them are in glee club and Grace has been in a relationship with Jake Puckerman for a long time. Yeah and Will Schuester is Carol's little brother and therefore Rosie's uncle. The plot is set around episode '100'.