So her kids' problems are food refusal for one, frequent colds and ambiguous mental health issues for another, headaches for another, and frequent peepee pants/bedwetting for another.
Definitely sounds like a family that should need constant funding and surgeries.
I'm becoming more convinced something sexually sinister is happening in the house. Nearly all of those four children's complaints (everything except the colds) are things that sexual abuse victims sometimes present with. I wonder if invasive tests and surgeries are used to keep them in line for abusive purposes, i.e. refusal to comply with abuser demands is met with more searching for surgically-correctable issues. Threatening psych ward commitment for refusal to comply was a common tactic for sexual abusers for a long time, threatening them with dangerous, scarring brain surgery if they try to get out of daddy's special friday nights by saying they have a headache one more time sounds like the dystopian nightmare update to that scenario.
This goes double because of the times they've fled states when doctors started prying too much. That's honestly extreme for most munchies, but par for the course for horror-house abusers.
I'd normally be right behind you on the sexual abuse speculation with the issues these kids are presenting. However, I think there are some special circumstances that might point elsewhere. These boys have been basically ignored for their whole lives, everything has been about their sisters, and they've had little control over what each next day is going to bring. Even when things seem like they're improving, the mother stirs up hysteria in hopes that a doctor will perform another life changing operation on those girls. Not to mention the mother is always reminding them in the background: soon it will be your turn for testing and scary (likely unnecessary) procedures. The girls are depressed because their lives are fucked and they have no control over the next invasive surgery till their out of their mother's grasp. Just like the mother never publicly celebrates positive health updates for the kids, I doubt she privately celebrates them either. The kids probably have no idea where they stand on the illness spectrum. Keeping them confused or in the dark about their own conditions makes it easier for her to make up stories to the doctors.
I mean, perhaps there is sexual abuse going on there too, it might make sense for why the father never steps in against his wife's lies and begging. Or he's just checked out. With or without sexual abuse, there's enough medical and emotional abuse going on there to trigger the symptoms they're presenting.
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As for Krissy's cancer, there have been so many mistruths from the beginning, who knows what to believe now? Maybe I'm just overloaded by all of her stories, but when did she get diagnosed with EDS? Is that why she originally took the daughters for testing, or does she have imaginary EDS? If someone needs a double mastectomy for cancer treatment, it shouldn't make any difference if she has EDS or not. Yes, wound healing would take longer, but either she needs it, or she doesn't. I was under the assumption that she had lumps, they were biopsied and removed, and that was that?
Why do people associate her sads with need for money? None of the things she's listed should require a request for money.
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Someone said they feel bad for people with EDS and that it must be hard for them to get treated and diagnosed since it's the munchie disease du jour. I have a friend with EDS and it's been impossible for her to get diagnosed. It's been a years-long process. She's in a small town, it's a two year wait to get in with a geneticist, and all the other doctors want to call it fibromyalgia. When she first told me I was like "oh, one of those invisible diseases" but as the years went on, I believed it and the queen who won last season of drag race had it and his symptoms were really noticeable so it is a real thing, but doctors don't treat it like it is. If I had EDS, I'd probably save as much as I could to go to the EDS research institute, or the closest local doctor who works with them. I can't imagine going from dr to dr with a real condition that they won't acknowledge because they don't know enough about. But for the record, Krissy doesn't seem to complain about the typical EDS things, like popping joints out of place due to hyperflexibility, etc. Maybe that's just one kind of EDS?