I suggest you inform the governing body and the local authority. Forget the headteacher.
Her conduct has been unprofessional.
There's a similar thread and an investigation was launched...the teacher/TA resigned.
Please do not let her get away with this
I would also state in the letter thst you have informed the Headteacher... who has told you it's a personal issue.
No it's not... this TA has caused your family to split.... this no doubt has an impact on your children.... which includes their well-being and education...It's just wrong
I would write the letter to The Director of CYP (children and young people) at your LEA.
Her behaviour is such that it would bring the school into disrepute if it got out.
I'll try and locate the other thread for you.
If it was me....she'd be out of her job by the time I finished.
There are key things you need to say for your complaint to have impact.
Please feel free to PM me if you want to know what you do on that front. I'm happy to assist you with drafting a letter.
I suggest you request from the LEA/school the code of conduct and disciplinary policy for staff.
Once they realise you know won't let it go ... they'll step up.
I'm a HR professional and I advise on such issues and sit on. disciplinary panels.