I stayed up last night and watched the finishers come in for about two hours. This event was not televised, but video & audio and liveblogging commentary could be had via the Ironman web site. I heard it announced when the man with a transplanted heart came in. Some people were accompanied for the last little bit by family members.
This is surely a pair of grandchildren, possibly with the oldest man in the race.
I caught a few glimpses of LotStreetWiz assisting the finishers off the course.
Other volunteers rushed across behind each runner to re-string the finishing-line ribbon. Some of the volunteers were children.