Okay, that makes it easy. You simply have two dinners. You cook the first one yourself for your friends and then you go to your grandmother's with your family for the second one.
13 seconds sound clip from the A Charlie Brown Thanksgiving movie soundboard.
You can hear this line at 00:06:23 in the Blu-ray version of the movie.
Quote context
[...]
- You can't explain anything to Peppermint Patty because you never get to say anything.
- I'm doomed. Three guests for Thanksgiving and I'm not even going to be home.
- Peppermint Patty will hate me for the rest of my life.
- What time are you going over to your grandmother's, Charlie Brown?
- We're supposed to be there by 4:30.
- I can't cook a Thanksgiving dinner. All I can make is cold cereal and maybe toast.
- That's right, I've seen you make toast. You can't butter it, but maybe we could help you.
- Snoopy, you go out to the garage and get a table that we can set up in the back yard.
- Little birdie, why do you fly upside-down? It's amazing at the way you get around.
- Little birdie, why you worry like you do? Don't you worry, you just do what you can do.
[...]