I have in laws like this, but they trump yours: They specifically TELL me (if it's a potluck or something)...NOT to bring a cake.
Me: Sure we'll come, what should I bring? (without mentioning cake)
MIL: We already have cake.
Me: Ok...so what would you like me to bring?
MIL: Well, we already have dessert, so don't bring cake.
Me: No problem. What should I bring?!
MIL: Oh...I don't know...maybe some chips? Did I mention, we don't need cake.
(this from the woman who was happy for me to make her wedding cake FOR FREE, and a stacked book cake for a grad party for 150 FOR FREE)
And you know what? I'm happy to oblige. I wouldn't want to waste my precious time baking for their ungrateful, back-biting, spiteful butts anyway. I'm the only one in our extended family who is a gourmet cook, and they all know it, so I think it's hilarious to show up with something I stopped and grabbed at the grocery store deli for their potlucks...just like they do for mine...still in the grocery store clear plastic container...MWHAHAHAHA (evil scientist laughter)
Don't even blink. Just show up emptyhanded and enjoy the party, and when they ask you if you want a piece of cake, do like me: Smile brightly and say, "Oh...no thank you! I get so much cake at home. Is that jello salad over there..."
can you tell I have issues with my inlaws?