My understanding is that bag and possession limits are individual. For that reason you are not allowed to party hunt migratory game birds. If you have more than the possession limit of ducks in your freezer. You should probably have them labeled clearly as to who shot them, and the licence number of the shooter. You should as well have the record on each migratory bird licence accurately completed as to dates when birds are shot, and the number taken by each hunter. Birds given away are still part of your bag and comprise part of your daily bag limit, and should they end up in your freezer will be counted against your possession limit. In other words, you cannot give birds away to household family members, even if they are licensed, in order to reduce your own possession limit.
You do not stop hunting because you get old. You get old because you stop hunting.
-Gun Nut