>> the hemples have another dream. some day, somehow they will find a way to talk with the girls. >> goldfish. >> would you like to have some goldfish? good choice. >> this just might be a step in that direction. >> and since the girls can't talk, they can just use their eyes so they stare into the screen and there's this technology that's able to pick up where their eyes are looking. so once they focus in on a picture, it kind of makes that selection so you think about it like a click of a mouse. >> what i really want to get to is where they can tell us what they are feeling and where they are hurting because right now we have no way of knowing and so when she starts bawling, it's really, really scary and daunting because we don't know what to do. i mean, it's like, how do you know what to do? >> but i also know, for all they have accomplished, getting to this point isn't enough. and so the hemples are asking, what's next? one path they settled on is deeply controversial. medical marijuana. >> almost done. >> chris an

he had come to syria to hempl, not fight. >> we each get one life, that's it. >> reporter: and the propaganda video made clear. a masked man with a knife appeared, claiming to be in the city of dabiq with kassig's severed head at his feet. >> here we are, burying the first american man. >> reporter: it appeared to be the same man seen in previous isis videos, known as jihad john. who appear nod other videos. >> it appeared to the same person. and obviously inside the government, working very hard to exactly identify him. >> reporter: he appears elsewhere on the video, where he gives order to dehead 16 men. unlike other videos, the other isis fighters show their faces as they commit the murders, and don naz za for officials tries to identify and track them. and also unlike other videos, jihad john makes no attempt to hide his location, with farmland in the background as he taunt president obama, eagerly awaiting the armies to come. today, misparents said they are heart broken, saying htheir son lost his life trying to ease their suffering. and the u.s. has not seen the end of ices. a young fem

for nearly four years, the hemples have allowed me to follow along on a journey where the word no is star ♪ how i wonder what you are >> reporter: as a dad of three daughters, i can tell you it doesn't get much better than this. >> yea!