It won't matter who is actually 'recieving' the FTB payments or does the paperwork, Centrelink asses you as a couple so FTB will be based on the lower income earner regardless of that being the one whose name is in the system or not. When I was with DD's Dad for example, he worked and I did not but he was still the one who recieved FTB but the lower income earner part was based on my income ($0).