Yes, this Duck family are floating on water in a pond. The greens are Duckweed (Lemnoideae), an aquatic plant that is high in protein and food source for aquatic birds and fish. You can see it also provides coverage for amphibians and fish. Read about Duckweed here. This Duck family are Egyptian Geese (Alopochen aegyptiaca) native to Africa. Most likely, they escaped the nearby Lincoln Park Zoo.
