Spoiler
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There are 2 ways to handle the kidnap of Garron's child - either rescue him/her (doesn't involve killing Big Red) or getting the deed from him. So if you've chosen one path you're stuck with it (unless you have an earlier save).
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"Butt-kicking for goodness!" - Minsc
"Cities always teem with evil and decay. Let's give it a good shake and SEE WHAT FALLS OUT!!" - Minsc