Though there is no hard and fast rule, as far as I understand, it may be preferable if you file separate rejoinder affidavits to the counter-affidavits filed by the two respondents, wherein you can appropriately deal with the issues raised by them. In case you file a combined rejoinder, you may have to specifically point out which averment in your rejoinder is in response to which counter-affidavit.
Dr. Ashok Dhamija is a New Delhi based Supreme Court Advocate and author of law books. Read more about him by clicking here. List of his Forum Replies. List of his other articles. List of his Quora Answers. List of his YouTube Videos.
.