Our expert says:
"Helpful" makes some useful suggestions, if a change to a different school is practical. Also, check out, through the school where he is, the availability of counselling through psychologists asociated with the education dept, who ought to understand this sort of problem. Even if he doesn't knwo of the details, he may be feeling some stress through recognizing that you have been stressed about the financial problems and the remarriage,
You say that you have spoken to the school principal, and although your son doesn't trust him to sort things out ( it's not easy for a boy to trust even a very good Headmaster) I gather from that comment that the head has said he WILL sort it out, and perhaps it's worth seeing if he can achieve anything useful, and discussing with him what more can be done. If the head cannot sort this out ( and yes, some teachers can be needlessly unpleasant towards vulnerable students --- interesting how they never pick on the bullies, only the bullied -- ) ten he ought to help both as regards finding psychological counselling help for the boy and potentially a transfer to a friendlier school.
Make sure that your son understands that you recognize that his situation has been unpleasant and that steps are underway to remedy this, and that you don't think anything the less of him.
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