Well, people can arrive here from various points in time. Which I know is extremely confusing. But because of that, there are some people here from the past, like Harry and Neville's parents. And Remus and Tonks. And then there are others who are here from our future. Like little Teddy is all grown up! And some future family members as well.
It will be quicker if I come to you. Just stay where you are in the park and I'll apparate to you. Then I'll bring you back to New London.