Marmie, please either let your sister keep them FOR you or bring them home and put them away for awhile if this is too painful for you to do right now. There is more of a chance that you will regret this years down the road if you give them away. There is a time to mourn and that is what we need to do but the time will come again to smile, trust me, I know. Whichever is easier for you to do, but definitely don't give them away. Some day you may need to hold them to cry and just feel the presence of your Mom in them, then again, when you are ready, they may bring you GREAT comfort. Just don't do anything hasty that you will regret.
My deepest sympathies to you. There are many here who understand your feelings. God bless!