So basically you want Stephen to make shit up like Brianna does?
While Warren is a fucking psycho, he is politically active, a passionate progressive and working of behalf of Brianna. As an elected official you can't claim stalking if someone is reading up on you.
All Stephen has to do is say that he heard that there was a member of the audience who was claiming they were related. He simply talked to the person to find out who his family was because he had never heard of the man, and the man got angry when asked about his mother and started shouting at him.
That answer fits in exactly with what Warren's FB posts said, but it has the advantage that Warren's FB posts make him look like a deluded idiot.