I just became gold. If you bring kids and have four or five in the room
Does everyone get breakfast on the weekends.
Not according to the rules (as of June 22, 2013):
Lounge Access/Free Breakfast
Free daily continental breakfast, light snacks and beverages for members and one guest in the Executive Lounge*. In the U.S. and Canada, choose between 750 bonus points or breakfast in the hotel’s restaurant if the lounge is closed. Select hotels will provide 1,000 points in lieu of breakfast in the event the lounge is closed. Learn more.
* At JW Marriott®, Autograph Collection®, Renaissance® and Marriott Hotels® (resorts excluded)
It's likely that some properties will enforce this rule to the letter. Others probably will allow children, at least up to a certain age. And still others will look the other way, even if a Gold or Platinum member brings two or three business associates who are staying at the hotel (but don't have such status) into the concierge lounge for breakfast.
For weekend mornings, when the lounge is usually closed, it's likely that many properties will provide two paper (or electronic) coupons; some will be more generous, especially for families with young children. For weekday mornings, when the lounge is usually open, it will probably be easier to swipe the lounge door and walk in with a family without being asked to leave.
However, nobody should stay at a hotel branded with one of Marriott's full-service brands with the absolute expectation that more than two people will get breakfast, unless that property has a proven record of welcoming more than two.