Ours is still theoretical, as we don't live all live together yet, but we are not planning on co-parenting. The children MC and I have together will be expected to listen to TGIB the same way they would an aunt, uncle, or babysitter- he's an adult, you will respect him as such, you will do as you're told if it's a safety issue, and when in doubt check with mom or dad. We make the decisions about them, and while we may asking for his perspective now and again, we will not need his agreement. And the same for his kids that TGIB has with his ex.
Pan Female, Hinge in a V between my mono (straight) husband, Monochrome and my poly (pan) partner, ThatGuyInBlack