It's a tough situation for you and your girls.
You will not be able to control what your ex or her family do or say.
The only thing you can control is how you react.
As a father You want to protect your girls it in this situation it's not possible.
What I would say to do Is conduct yourself as father and man you want your girls to see. Never bad mouth their mom or her family to your girls. And always be there with hugs and love for your girls.
Your girls strength comes from you.

bipolar episodes last usually weeks or months. A few days if you are lucky.

I'd suggest what you are seeing is something else?

You can dump your wife but you can't unmake her the biological mother of your children. When I got divorced I did two things, never bad mouth the kids mom, and do what is right for the kids, priority, do that and that makes you a father. Keep this in mind, your children are going to turn into adults in their own right and deceide the truth for themselves, mine did, much to my ex's consternation. Could't have worked any better. Just be patient.

curious ohh the episodes last longer but not as intense, or they are something i am used to,

Rev i understand that part its dealing with how they are now i am questioning, everything i do she undoes, its very unnerving and when your daughter has special needs its even worse,

Strength to you, tough part is that all the rest of us can do is try and help, you have to make the final decisions, blessings to you.

be sure to explain her sickness to the girls yor not there so when eppisodes come they may be the blunt of the punches. tell them mommys sick and doesnt mean it.
I just found out my husband is bipolar yesterday 20 years. Our daughter took allot of punches in her childhood. everyone around saw him doing this, I just ducked and covered her and walked away or stepped in front on the comments to stop it causing big fights to protect her. I never knew then that he was sick. Wish I did, it would have made things less harmful to her. 42 now and it was the worst episode ever violent towards his uncle physical. It was like he was on drugs. Went so far as to make him take a drug test to proove he wasn't using anything. When the test including oxy's, vicodines etc showed all negative, my jaw dropped I was as well as many others who noticed the manic phase did. He was out of control, he kept saying I don't know why I do this, I don't know why I say these things. Fortunutly his mother was here from AK and noticed all of the signs that her herself has. I never knew she was bipolar, she never said. I know she had depression but not bipolar.
I'm still very nervous to see it come out again.
It took and act of god to get to the right doctor and you know it was hard just getting him to the 1st one. I myself begged my physician to help him. He was so mean I am sure asking him to drug test for me didn't help the situation which made him go OFF... The one good thing that came out of that test was everyone who has seen him go off, actually realized that he truly was sick and its not drugs.
not sure if this is the case with all bipolar pts but he had all the
symtoms of a drug user no sleep up all night, can't stop moving, rapid weightloss, busy all the time, no concept of money spending what we don't have, the only thing he didn't have was the eyes. Why no big pupils? thought he was taking pills then. I feel bad that I accused him. I didn't know. I couldn't live like that anymore, he was so upon himself, he's beautiful and i'm a pos. keep all this in mind, this disorder doesn't go away so make sure your girls know that she's sick cuz if I knew this along time ago it sure would have made my life allot easier and my daughters too.