Explanation

Her brother along with her parents " insist" that she remain in school

• eliminates an error in the sentence

Her brother along with her parents "insists" that she remain in school

اس کا بھائی اپنے والدین کے ساتھ "اصرار کرتا ہے" کہ وہ اسکول میں ہی رہے۔

...

"Her brother" is singular and requires a singular verb.

"Along with" does not constitute a plural subject - if this had been "and" then insist would have been correct.

ND16-8-2023