I know, right?! It's like those people that wear these weird bands to show to the world that they've been 'taken' or whatever, like, I get it, but please - stop shoving your 'lifestyle' down my throat, ok?! Call me old fashioned, but I think they should keep their kinks to themselves and shouldn't be allowed to wear their weird "wedding rings" in public where children can see them!
OP isn't asking how to introduce their kids to the concept of BDSM or asking to explain how they like being tied up, for fucks sake, they're asking if there are child friendly books to help explain that you can love multiple people. Most monogamous folks introduce their partner to their kids after 6-12 months, so why wouldn't poly folks be able to do the same?
OP - Unfortunately, I think books around LGBTQIA+ and then having a conversation might be the best you're going to get from the quick research I just did. At the very least, your options are slim if you do manage to find anything.
Sure! Click the link at the very top of the page! You know, what this entire conversation is theoretically talking about? It takes you to a Home Assistant page and even has some details on their philosophy and links to even more details about their privacy focused philosophy! I thought saying essentially "read the fucking article" would be pretty asshole-ish and wouldn't contribute anything to the conversation, but I also thought that your question contributed nothing, so I downvoted.
Did that answer your question sufficiently?