Can my kids play with kinetic sand on Passover

Shalom, Thank you for your question. As you have seen my previous response about kinetic sand, I will only address the question of Passover. I assume you are asking about whether the sand is chametz. To the best of my knowledge such sane is not fitting for consumption – even for a dog (which is the halachic standard used for these questions), and as such is permitted over Pessach Chag Semach.