Ok I thought Lauren is Sloane's daughter too, and even speculated that she is the real Julia Thorne. Senator Reed is not her birth father she is adopted. When Syd was brainwashed they told her you were born in London, abandoned, adopted, blah blah so maybe Lauren is Sloane and Irina's or perhaps Jack had an affair years ago with Senator Reed's wife ? Just acn't tell. One thing is that everyone is speculating thast the new sis is Sloane/Irina but what about Jack ?
Also what is the secret that Vaughn discovers on Lauren's mom I wonder, hmmmmmmmmm.