Why didn't anybody say anything to you before you all sat down to eat?

It's alright OP just serve yourself a plate to go. Just put all kinds a food and when you leave just say thanks for the food.

All these FMLs I've been reading lately, make me really appreciate mine. Sorry yours isn't very nice OP.

I'm sure you didn't miss out on anything OP, they're gonna have a hard time eating without any knives.

Sometimes, someone amongst the family hears the words "family dinner" and stars inviting other family members unbeknownst to the one actually hosting the dinner. My extremely elderly in-laws do this all the time to the point if we don't get a personal invite from the host themselves, we just don't go. Then again, my family in-law are also the type to let you find out that you weren't invited in the same manner as you OP. It's frustrating, and passive aggressive as well. We just leave, to be honest. Not the best solution but I can't waste my time in such petty behavior. Point is, you're not alone. Chin up.

Since when is 12 big?

Just stick your face in the serving dishes like a pig feeding from the trough. That'll show 'em to "forget" you ;)

Ouch, maybe thirteen IS an unlucky number.

Time to curse the newborn.