I think I'm going to get cross about family members returning gifts.
Why would you get mad about your family returning gifts?
They just love to return gifts. Its not right.
You shouldn't try to control what people do with gifts that you've given them. Maybe you can ask your family what they want and get them that. They will be less likely to return gifts they want.
No. I'm going to be a grinch this year.
You shouldn't let this ruin your holiday spirit. Just include a gift receipt, so you won't need to know if they return it to the store. You wouldn't want you're money wasted on something your family can't use would you?