Congratulation for having made it to Top 40. I've read your idea and think it has a lot of potential to hold together whole families. I hope you can follow up on the idea.
My thoughts when reading through your remarks were how should the separated have access to the RFID/GPS data. I hope you don't forget this part of the story during your innovation and creation process. Because if such a bracelet is needed we have to assume not enough access to technology. I would recommend to have some centralized access for the separated people to the program needed.
Anyway I wish you good luck with your amazing work!