Mom and dad and two kids have to cross a river they find a boat but is so small it can carry only one adult or two kids at a time how can the whole family get across the river?

The two kids go across, one brings the boat back while the other kid stays on the other side. Then 1 adult goes across, and the kid that stayed on the other side brings the boat back. The two kids cross again, and 1 kid brings the boat back. The other adult crosses the river, and the other kid brings it back. Then finally the two kids cross and... voila!