Start with Star Wars in whichever closer to original video version or one of the projects you desire. Then let them discover the stories for themselves.
I think it works best this way and thus they see the OT in order and then go further with the prequels and then if necessary can delve into the Disney stuff if curious.
And yes I think all kids naturally gravitate towards ROTJ and then over time becomes less attached to it. I did, and we all seem to have!
Ultimately try and make it something fun and enjoyable that can be a fond shared experience. For me Star Wars was a solitary engagement as a kid because no one in my family liked sci-fi or adventure whatsoever but I can imagine it being a real keepsake memory for kids these days just getting started.
And if they get really, REALLY hooked perhaps dabble in the good ol’ EU. And especially the radio drama!!!