Why wont they just use the account you ahve set up already? Its going to the same child??? Unless they think you and dp will be taking money out...which i dont think you will? Maybe this is there reasoning beind wanting 2 accounts?

I dont think its fair that if you dont give them the birth certificate your relationship is over? Is there another underlying issue?

maybe just let them ope the account to keep the peace..as annoying as it is sometimes its better to just keep quiet and let them do what they want :P

Oh Ds has just one account that i set up which his great nana puts money into
Good luck hun xxx