Originally Posted by
LordLoungeDragon
If you hold a booking for one person, you can officially take your partner with you (spouse stays free). The benefits, in your case the free breakfast, is not granted per T&Cs. However, in reality I know only very few examples where the breakfast isn't extended to ones spouse. My advice: Expect the free breakfast also for your spouse but be prepared to pay for it if they insist.
I wonder if it's changed?
As per
http://hhonors1.hilton.com/en_US/hh/about/gold.do :
Continental Breakfast.
You will receive complimentary Continental breakfast for you and
up to one additional registered hotel guest each day of your stay.