"They're ... a package deal. For better or worse. Lizzie has a very strong personality, but she's also been through a lot. Some of which Josie put her through. So Josie is very protective of her sister, and so when they both decide that you're wrong it's ..." Finch makes a face as she tries to figure out how to best phrase it. " ... like you're being hit with a wall of Saltzman."

Basically, they're your average twins, but given that they're supernatural women in a supernatural world, everything seems turned up to eleven.