My uncle has three sons, ___ work in the same office. Which of the following is the best form of pronoun in the above sentence?

✅ কেন সঠিক: Two clauses joined by a comma need a relative pronoun: ‘…, all of whom work in the same office.’ ‘All of whom’ links the second clause to ‘three sons’.

❌ অন্য অপশন: ‘All of them’ and ‘They all’ create a comma splice (two sentences joined only by a comma); ‘Who all’ is not standard English.

💡 মনে রাখুন: Pattern: some/all/none/both + of whom (people) / of which (things).