SHELTER ISLAND, NY — George Soros and his family have been on a property buying spree, scooping up homes and prime parcels of land in an idyllic Hamptons enclave, angering local residents who worry the billionaire land grab is already upending the tight-knit community, The Post has learned. The family now control nearly 120 acres of property on Shelter Island, which is only accessible by ferry, making the Soroses — billionaire Hungarian-American investor George, 95, his sons Alex, 40, and Gregory, 38 — the largest private landowner in the community. The 18 properties they have bought were purchased through myriad...