How should we handle baby mama?

My husbands ex signed over custody when he filed a little over a year ago. She’s extremely unstable and the kids wanted to reside with us, she didn’t fight it. We’ve had issues with her since then trying to control things we do, and my husband usually just says “this is my job now, I got it” when it comes to schooling, medical etc. In our state sole custodial parent has ALL medical, welfare, and education rights. She has no say in anything he does with them, all she gets is weekend visits. She’s been constantly accusing us of “falsifying” the paperwork, and stating multiple times it was a “one year contract”. It’s a modified divorce decree, motorized and signed by a judge that he’s sole custodial. It’s getting to the point where she’s almost harassing us with it. Literally a conversation will be “on my way to get the kids” and she goes “I hope you know I’m fighting your claims that I gave up my rights”. She has NO understanding of the papers that SHE signed. She’s been putting it in the kids heads that she’s in charge and constantly asking if they want to be homeschooled and stay with her more. My step daughter doesn’t at all, but my step son really wants to be homeschooled, which she knows and is using that. It even states in the paperwork that they’re to attend school in our district. It’s getting exhausting. We try to be civil with her and she’s just nasty. We’ve tried explaining the paperwork and even sent her a screenshot of it last December. She got a copy in the mail last May. It’s also online but she claims “it disappeared”. I looked at it yesterday on there 🙄 I almost want to give her another copy just so she has it. Ignoring her really hasn’t done much. The problem with ignoring her is she thinks she has the control and then again uses it on the kids. I’m just stuck on what to do. And note, my husband handles ALL communication. I stay 100% out of it!

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