Sarah Ferguson, who is Prince Harry’s ex-aunt, is in NYC to attend engagements for Climate Week, which also finds her ex-nephew in the Big Apple for the same good cause. If reports are to be believed, the fiery-haired royal rebels could be set to meet for “secret talks” thanks to Harry’s close friendship with his cousins, Princesses Beatrice and Eugenie. On her Instagram, the former HRH shared, “I have the pleasure of being in New York for this year’s Climate Week and want to bring you behind the scenes! It was so inspiring to meet so many motivated young people who are looking to make the fut…