My mum is classic for this kind of thing, and here’s what I’ve figured out over many years.
She is fundamentally concerned only with her public reputation whenever I alert her to an issue with one of us (or the kids). Doubly so if it’s a psychological/emotional issue. But even for basic ‘Turns out DD needs braces’. Somehow it all reflects badly on her, and she gets this defensive, panicked reaction. Like it’s all so embarrassing and shameful.
It’d be funny, if it didn’t underline so obviously that she couldn’t care less for the person with the issue, or those supporting that person directly. Or any of the other implications for our family life- financial strain, the effort and energy of researching/implementing treatments, us coming to terms with a new reality, etc.
It’s basically all about her, and ‘what will my friends say’ and ‘will this affect my social status?’.
Reread your parents email with this in mind to check. I bet it’s about them, not you or your kids.
All you can do with people who use the ‘it’s all about me’ filter is to cross them off your list of ‘supportive folk I trust with info.’ Trust me, they won’t ask if you don’t volunteer future updates. If it comes up, just be bland and vague and say ‘we’re getting the professional and emotional support we need, ongoing.’ Shut them out. They are the embarrassment.
And limit time with your kids. They don’t need this ignorant hurtful poison dripped in their ears. My DD (9) rang granny excited to tell her that she was getting braces and that they were letting her choose the colour. Granny immediately said to make sure they weren’t fitted until after school photos day, or she wouldn’t want the pic up on her fridge this year (as she normally does). Delightful.