This is not child porn, nor porn of any type. They are naturists, a/k/a nudists. You may have some in your own neighborhood. It is not unhealthy for children to grow up in a naturist home environment. Unlike some posters here, they will not have a misplaced sense of shame about naked human bodies.
There is nothing wrong with a happy nudist family, however posting pics of your nude kids, especially the ones older than a year is dangerous. There is far too many perverts out there that now have nude pictures of your kids. Not cool.
Wow. This needs to be TAKEN DOWN. The children need to be respected for their privacy. This truly crosses a line. The family might be ok with taking this pic, but I can almost 1000% assure you that this photo does not need to be shared by your website for perv’s to copy for their own personal use. Use your sense of decency and REMOVE this photo for the sake of those children. Totally inappropriate. This is child pornography even if it was not intended so from the parents.