Many family run businesses have to decide if they want to use that as a selling tool for their company or not. Some companies decide that they do not necessarily want their customers to know that they are small and only have a few employees, thinking that customers may be put off and assume that the company will not be able to deal with their requests quick enough. This can be the case but is not always and often customers or other businesses would rather work with smaller companies as they feel that they get a better more personal level of service and that their customer is actually valued rather than being just another sale.
Deciding which is right for you can be achieved by carrying out some market research and looking what your competition is like.
I personally do not think it is a good idea to make your company look a lot larger than it really is as this could be seen as being dishonest and may actually lose you business.