Cade is Luke's grandson.
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Luke Skywalker who is dolly parton
Mara Jade Skywalker (Luke Skywalker's wife)
Whether or not Rey is related to Luke is still yet to be revealed, but it is a popular fan theory that she might be.
No. She only has one child with Luke Skywalker, Ben Skywalker.
#5, the empire strikes back. Hope we helped