I respectfully disagree. You got gifts for his family, etc because you felt it was appropriate. They are not responsible for his mistakes.

If you'd still like to give them the gifts, I'd either drop them off yourself to them, or ask your ex how the two of you should handle the exchange for the families.

Of course, if you don't like them, and only bought out of a sense of obligation, then I'm with Leed. Get your money back and go out and have some fun. lol.