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Let's start with the easiest of your questions: Are any multi-planetary binary-star systems known? There are, in fact, quite a few: 55 Cancri: Five planets orbit 55 Cancri A (a G-type yello...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:50Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/48190 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/