Didn’t he worry about her turning to the dark side?
shareHe did not train her, he told her a couple of useless things for her to go away. Leia sent her and chewie was with her, i think Luke trusts his sister that much.
shareHe did not train her
Luke just give some hobo wisdom which didn't help her much if at all. Leia was the one that trained her before she force killed herself after force flying in space back to the ship.
shareLuke was always working for the dark side. From the beginning. I can't believe how many people haven't realized this. It's clear if you go back and watch the original three. Anakin was just going about his business but Luke had to go in and turn him against the Emperor.
did Luke Leia and Han even know she was Palpatines granddaughter?
shareYes. They knew apparently lol.
I think a better question is "how did Luke and Leia know Rey was a Palpatine in the first place"?
There's nothing whatsoever in TFA and TLJ showing they knew who Rey was or where she came from.
Luke was even startled when he asked Rey where she came from in TLJ.
Just more plot holes in the sequel trilogy.
Question should be : if he knew, why didn't he kill her on Skeletor Island?
shareAs a Palpatato Luke thought he could peel, cut, mash, boil, fry and bake her. But he was wrong, she was too salty for that !