Maybe talk to DS1 about it. Instead of talking to a teen, talk to another adult iykwim. If he & his gf can have their space at her house, you aren't exactly taking that away from them.
Maybe sit them both down? Say you need to get their point of view. Explain the whole situation & that you hate the idea of taking their privacy away, but that you need to think about everyone. If you make them part of the decision, rather than just tell them thats the way it will be, it might be alot easier, with alot less to deal with from DS1 iykwim.
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