Originally Posted by
NOLAnwGOLD
No, technically you can't get the free bags for others outside of the PNR you are booked in. Others with a different PNR (reservation) can be linked to yours (in case say there is issues with flight) but it doesn't get you the free bags. However, a nice check in agent maybe able to get that done. Also you should check as many under your name as suggested above.
For future complex bookings, I usually call the agents and have them do it. I suspect they have a way to get you all under one PNR
All passengers on the same PNR must be booked on exactly same flights, and in exactly the same cabins. Since OP and wife are in F and rest in coach, it's not possible to be on one PNR. This is part of the reason DL has allowed benefits to be extended even though technically should be on one PNR.