Finn would be the protective older brother. He'd be loveable.
Tina would be a middle child. Often forgotten, but she'd put family before anything else.
Rachel would be the drama queen.
Puck would be the prankster. He'd constantly be pulling pranks on his siblings.
Santana would make sure nobody ever messed with her siblings.
Sam would be the adopted sibling. At first unwelcome, but soon accepted.
Brittany would constantly be getting homework help from Mike and Rachel.
Mike would be quiet, but loved by his siblings.
Mercedes would be the diva. She and Rachel would constantly be on each other's nerves.
Kurt would be tougher than his siblings thought.
Artie would be there for his siblings. Always.