It's my mum's 60th in a while and I'm baking her a suprise cake. The only thing is that our family have loads of different tastes so I was going to make 3 small tiers - sponge, chocolate and fruit. The only thing is then, how big do I make each one because I can't really visualise how many people each will feed, like I usually can with one big cake. It's only got to feed 6 of us, and leave a few pieces over for a couple of friends, and to eat later.