joining me from parkland, florida is sergio rosenbach. the family is marching today in parkland. sergio, thank you for joining us. tell me why it is so important for your family to take part in today's events. >> because we are participants. she's a survivor. all of us are victims. we have to be here. we have to support each other. >> sergio, what is it that you believe that alexandra and her classmates are looking for? what does success look like? stricter gun laws, smarter gun laws, something specific, or are they trying to bring attention to this is a movement and they have some power? >> i think it is a combination of things. i think gun law is their priority. attacking attack and assault weapons is their priority. they are smart enough to recognize that they can't bite the whole apple, which is the second amendment. they are smart enough to recognize that people have the right to own guns. they're smart enough to argue that they don't have the right to multiple rounds high velocity weapons. so that's their number one priority. along that, they will develop other thoughts as t