What could have possibly happened to the Park Family in Parasite after Mr. Park gets stabbed, Mrs. Park faints, the son gets seizures? No one seems to be discussing about it and I took the courage to ask it.
The scenes of the movie after the party seemed fairly definitive, so I'm not sure if you missed it, or are asking about what happens after that. After the party, we follow up with the Kim family. We see that the daughter died from her stab wound, while the son and mother are on probation for fraud, and nobody can find Mr. Kim. The son discovers that his father is living in the bunker in the mansion, and promises to himself (or the audience) that he will try to earn enough money to buy the mansion so that his father isn't trapped.
That is all we can say for certain. What happens to either the Kim family or Park family in the future is unknown. As such, any further discussion would be conjecture.