In my experience the school raised the question of legal action regarding ‘attendance issues ‘ after my son had been ill for 3+ years and he wasn’t improving on a schedule that suited their attendance targets. Fortunately we had good medical support so the threat was never mentioned again, but things continued to be difficult even tho said child was improving by then.
They came down very hard from day one when the second child fell ill, it took 3 months to get any support even though she was in an exam year. I’ll add that individual teachers who knew the children and us as a family were helpful, but the problem was with a particular member of senior management through their GCSES who didn’t want to listen and understand. 6th form was great, in the same school but different management.
I’ve never personally heard of a family that had a child taken into care, but certainly the pressure is there all the time. And that is just wrong, as is having to constantly fight for support and try and educate everyone around!