Yes! The Lodge at Deadwood https://www.deadwoodlodge.com/ Tell them your with the Stormy Walters Wedding and receive the discounted rate.
Kids are of course welcome! But it is absolutely the parents call.
Semi Formal feel comfortable, and look awesome! so if those shoes are too high or that top button is too tight, let it all hang loose. The venue is grass and outdoor, so make sure you plan your shoes accordingly.