Welcome to the new world. I hope you're reducing, reusing, and recycling all that cardboard. And while you're at it, teach your kids how to make almost ANYTHING with it. One example is using templates and 3d software to make a life-size Xenomorph with just a bunch of amazon boxes and some wood glue. That's just awesome.
Let's be honest. No one cares what music I think you should expose your kids to. Like me, you're going to raise them on what you dig, and hope your kids like what you like. Equally the case, there's a LOT of really amazing music and it's impossible to curate all of it for everyone in every way. One of the most important YouTubers in my opinion is Rick Beato: because he's teaching people to be better at listening to their own music. If you can learn to critically listen to the music you already know, then you can be better at choosing which material will impress your kiddos. The linked video is a great video essay about Smells Like Teen Spirit, and breaks down what's actually in the recording-- what set Nirvana apart from other rock and made the music indelible. (Spoiler: there's jazz in there)