I agree that there's so much potential after this set up, especially with Rey and Kylo sort of manifesting as two sides of Anakin Skywalker and essentially battling it out for the Skywalker legacy. Is this family just a horrible mistake that never should've happened? Or will there be some good to come from this super powerful but also cursed family?
I'd go 90% on Rey being Luke's daughter. She just looks too damn emotional in the last scene to be rando girl handing back a lightsaber. Those things have always been Freudian symbols in these movies. And the camera lingers on them staring at each other for like 10 seconds. No reason to do that unless there's some relationship.
I feel bad for Han and Leia. What did they do to deserve such a crappy child.
This is puzzling cause even middling and outright bad kids movies make decent money when the competition is low, which it is right now for family fare. Hotel Transylvania 2 even managed to do better.
To be honest, each HP film had a cool new 'thing' that was well marketed to the general audience. Even DH1, which many found to be snoozeworthy, really sold the horcrux hunting angle while DH2 played up the big final battle.