What is your opinion on re-giving unwanted Christmas presents?

I know it sounds a wee tad unappreciative or ungrateful, but generally we all get something we are not going to use, or don’t want, don’t we? What’s your views on re-giving them to others?
Would you keep them regardless?
Would you tell the person who gave them to you?

Personally, I’m grateful for any present I receive, I have been given things in the past, I’ll never use, but to me they are kind of special and the chances are my kids or grandkids will get them. I was once given a gift back, I’d given to someone the year before – and to be honest I was a bit miffed about it! lol. (It was an aged relative but still…...........lol)

What’s your views?