Assuming you are flying on NW or DL, you can put your miles in Korean Air's Skypass provided the class of service is eligible. With Skypass, you can link up to 5 family members' (must be immediate family members, excluding siblings) for award redemption purposes. Each member still has his/her own account, but the miles in each account can be pooled together to redeem for awards. With each roundtrip @ 18,500 miles, you have about 55,000 miles for redemption. May be it's worth for you to look into.

LAX