First cut of Filming

So, I spent my saturday filming, and I managed to get some real good footage and my family got into their roles so well, my mum even shed a tear as it all started to feel real! So I come in on the Monday to upload and edit, but the previous person that used the camera and tape, their footage has converged with mine and so I cannot use any of it! Very annoyed. So hopefully I will be able to redo it all before it's too late!