Beautiful cakes!!! As for your niche...pick something you have an interest in. If you don't, you are going to dread writing all the articles you are going to need for it and make it that much harder. If you want to do something to help push traffic to your family business site, think about occasions that would need special cakes...retirements, birthdays, graduation, wedding, engagement, the list can go on and on.

Or use the information you have already learned from your family business and affiliate with products that would help your existing customer base. Say you have a lot of customers that buy kid's birthday cakes...make a site that sells decorations, has decorating ideas, games, bounce-house rentals, etc..