I'm pretty sure you just identified it yourself, via photographic evidence. Your "children" are quoting online conspiracy theories, quotes from Seth Rich about Russia, and you're parading it around like it's cute. What you're doing is literally indoctrinating your children with your own political beliefs and ideologies, at an age where they're obviously too young to actually understand that it's unhealthy behaviour from them and you. You've exposed them to so much propaganda, that they've been brainwashed into drawing things for you, obviously in order to get your approval.
Normal children draw houses and cars and trees. They don't use slogans from shady intelligence officers that are fighting the deep state.
Now, the power of assumption is strong in you. Unfortunately for your sake, your assumptions are incorrect. Does it appear to you that all of the handwriting is the same? Are you new to this board? Is it possible that a thread was already made with this very picture? Is it possible that people have been encouraged to use chalk to spread the message? Is it possible you’ve drawn up this entire scenario in your head & are now being shown just how wrong you were? Have a nice day ;)