It has been a long standing policy with eBay that the friends and family of an eBay seller could not bid on a seller's items. The reason for this policy was that eBay had concerns that the seller's friends or family would bid on an item to increase the price, but actually have no intention of really buying it. This is a practice commonly known as "shill bidding."
This past summer, however, eBay quietly decided to change its Bid Shilling policy without telling anyone.