Update- at 16 my kid is finally completely enthralled by Fellowship of The Ring.
Don't force films or books on your kids when they're little.
Ask them.
When they're ready- they'll say so.
And if after trying it's still not for them-
Let it go.
You're raising a child. Not a clone.
Find other stuff to engage in together.
Signed- my kid cannot get into Star Wars and that's perfectly fine
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I got into my parent's books because I saw them be enthusiastic about them, and they were available.