Sorry to hear about your folks' dog, leeshie
It's sad that they age so quickly
It isn't too unusual for a dog to pace after having a seizure--the brain activity is still settling back to normal. So that isn't too surprising. But, IMO, it probably would
be a good idea to leave your dog home when you visit tomorrow, just to keep the excitement/stress level down in your folks' dog.
With luck, this will be the only seizure your mom and dad's dog has and your holiday celebrations will be incident-free!