Fire and Wind

In china, there was an old man who had three grown-up sons. They all lived in the same farmhouse because that was the Chinese way. The old man's wife had died and he wanted his sons to get married. so the two oldest married women from the next village. The new wives wanted to visit their families in the other village but as a condition of leaving one wife must bring back fire wrapped in paper and the other wife must bring back wind wrapped in paper or else they cannot go back and visit their families again. How will they bring back something so impossible?