Not to speak obvious but there are two easy ways to check in and not need spouse or kids present and (most likely) get same letter BP and be in A or B group.

#1- Use on-line check in at midnight from home or like I did at a kinkos. All you need is Res #'s. Remember that res's must be split. Guarantee of A BP's.

#2- Use kiosk at airport. One person can check-in everyone. All you need is CC or RR card.

No need for ID and no need for everyone to even be there. ID's are checked by TSA at security CP ONLY. WN tells everyone at gate to put ID away.