Those with kids ages 8-15 with an ADHD parent....how do you make sure they are OK?

Anyone have any advice or suggestions or tips on how they coped with their kids aged 9-13 experiencing and living with an ADHD parent? Specifically when the ADHD parent is in extreme denial and defensiveness and deflection on ALL his behaviour. So ultimately, the child(ren) is seeing a disregulated parent for a consistently long time with no connection between his mom & dad. It breaks my heart. But I'm barely keeping my head above water myself and trying to save myself and my son and I have to let my husband drown bc he's not willing to do the work to swim on his own. (in my opinion, of course). 

Aside from trying to address it as best as possible when issues arise, and dealing with the fact that it's possible/probable that the child has ADHD but the parent who is not managing well, is just TAKING OVER the house. Their emotions, their feelings, their depression, their unmanaged ADHD...all of it just consumes  us all. 

How did anyone address it in their house and how do you escape this or change this situation while still living with the ADHD partner? And if leaving in this moment is not the option, how do you change your and your child's future and address the hurt/pain/anger now? 

All resources, blogs, tips, tricks and experiences from adult children are welcome. In fact, any of it is welcomed to be honest.