Many Rivers to Cross

Let’s take a break from puzzles and go on a rowboat ride across the river. There are four adults who want to cross it.  They come upon a boy and a girl playing in a rowboat.  The boat can hold either two children or one adult.  Can the adults succeed in crossing the river? If so, how?

Leave me a comment on how you think these adults can make it across the river using the rowboat.  I look forward to all possible solutions.

Source: Great Critical Thinking Puzzles by Michael A. Dispezio, page 31