Originally Posted by
Kiwi Flyer
The extra guest is not additive. You can bring one guest (for 2 qualifying reasons). If the 2nd family member is young enough (think toddler or small child) you may will probably be okay other than at BA lounges.
My experience with the AA FL lounges is you get in if your toddler is calm, but get politely asked to use the biz lounge if he's throwing a fit and screaming when you walk in to the lounge. A distinction i found entirely reasonable.

The AC lounge in ORD in this case has a kids room.