You should be fine. The Citi AA free bag benefit (and I believe also boarding "benefit" <if you can call Group 5 a benefit!>) is tied to the primary cardmember's frequent flyer number. Just make sure this is associated with your booking, and you should get the free bag benefit even if you don't use the card at all. It's a card member benefit that is tied to your frequent flyer number (e.g. your frequent flier number is flagged as being a card holder), and is not linked to actually using the card for the booking. The number has to be associated with the reservation at least 7 days prior to departure in order to get the benefit. In order for your family to also get a free bag, make sure they're booked on the same reservation as the primary cardmember.