100% go for the theme that's appropriate for your customer base. When I put pins in at the brewery I operate I was surprised to see how many of the dollars were being dropped by children that came in with their parents. I'd recommend at least one very family friendly / kids-would-recognize-the-theme pin, and I'd check with the brewery before bringing in anything like IMDN that might make children cry.
*note this has nothing to do with my opinion on whether you should bring your kids to a brewery or not so please do not hijack this thread with that debate.