What to do when someone gives you stuff you already have?

This may sound bad when its said though I have done it, regift for Christmas to those you know who don't know who gave it to you. Marketplace sell the items so you can get extra cash for them and help to get the space needed. Family always do need things too if anything breaks down or a full set of glasses at some point.

For most things I kept the duplicates - I have more wine glasses than anyone could reasonably need, and I think I have about three crockpots, fortunately they are all different sizes. Some things I traded with my sister (I had several sets of wooden salad bowls, she had lots of lamps...). I would tell a close friend if they gave me a duplicate of something but in most cases I usually kept it to myself and worked it out later on my own.