This looks like a typical "lifestyle" picture that was used a lot in the 80s and 90s. It was originally, I believe, done by commercial photographers who would take some "models" out (not usually family members, but a fake family) and do a bunch of "aren't we having fun now" pictures.
Often the were done for stock then sold to soap, or feminine hygene, or drug companies.
The style was later picked up by portrait photographers.
This picture looks like the outtake of a series of "ok kids, climb to the top and tumble down" series.
Unfortunately, if this was the best one, the shoot was a bust.