E-party gift from univited guest. I feel terrible.

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Yesterday we had our E party. We had to keep the guest list small, cause our friends hosted at their house and the yard is small and if it rained, space is limited inside. Ok, I have a 1st cousin, that I rarely see (just on holidays and sometimes I get invited to his kid's parties). I didn't invite this cousin, cause he's a rude person, makes racial comments, makes comments about people being overweight to their face, etc. Meanwhile, everyone says, he's just joking. However, my brother lives around the block from him and is at his house almost everyday. So yesterday, my brother brings a gift from this cousin to our e-party. It was something from our registry. It was obviously all the wife's doing, cause he's a man and wouldn't think of all that. I feel terrible now. Do you think I should call the wife and tell her that we had to keep it small? Or should I just send a thank you card and leave it at that.