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hot take: duke thomas and bruce wayne dont have a father-son relationship and thats fine! They have a mentor relationship in which Duke is learning from Bruce and doesn’t need him to replace his father.
I also don’t like the whole ‘bruce adopts duke’ thing either because… Duke has a family? He has a living mother who is now cured and a cousin he happily lives with.
You can still have plenty of lovely batfam moments with Duke included but not at the expense of the erasure of *his* family.