I'm going to talk to the room supervisor tomorrow and request a meeting. My main concern is that the special needs member of staff is being used as an additional general teacher in the room - based just on my observations from dropping Iris off and picking her up (which I know may not be at all indicative of anything!). So I think X isn't getting the support he needs. The onus shouldn't be on Iris to tolerate this. And I still feel I shouldn't have to tell her to avoid this child.
Knowing how Iris is with Callum, she will eventually snap and retaliate at X. She'll put up with being hard done by for so long and then she'll crack. And it's not pretty when it happens. I don't want a situation to occur that Iris is hurting another child.
It's just not a conversation I want to have - I think you're doing a cr*p job of supporting X and need to know what you're going to change to safeguard my daughter.