The rules are ridiculous. It is none of their business according to the law. Do with that what you must. I am apalled his mom has tried to tell you also. What is that all about?
Since you are not a JW, you are under no obligation to play by those rules. Just go about your business. Also, they will probably give him their approval to get married again taking into consideration you are worldly and all, and have probably had sex by now anyway. But don't be surprised if they stalk you. Under no circumstances would I play by their rules.