Thanks for your reply, sir. He declared the nominee as his second wife, but the first wife made the death certificate in her name. The second wife doesn't have any proof of marriage. Kindly look into the comment below; one of the seniors commented like this. I need your comments on whether it is correct.
Note
In cases where there are two or more widows, the family pension shall be payable to the eldest surviving widow. On her death, it shall be payable to the next surviving widow, if any. The term "eldest" would mean seniority with reference to the date of marriage.