How hard can this be ..................

All that's required is one picture. One picture for the bathroom to hang above the bath. In the picture all we need is the bath and our two children. How hard can this be ? So far we've had two shoots (on separate days - I'm not mean enough to make the kids have two consecutive baths) and shot just over 70 frames. I *think* (hope, pray etc) that we might have got one keeper with both kids looking engaged from last nights efforts !!