Short answer: No. The Church does not teach that all human persons are descended from Noah and his family. The idea that we must all be descendants of Noah is based on the false assumption that the Noah story is entirely literal. In my opinion, the story of Noah and the Flood contains both literal and figurative elements.
There was a literal flood event, but the extent of the flood is figurative. The flood did not cover the entire surface of the earth. The flood did not kill all human persons, nor all animals.
Noah did build an Ark for his family. There were many animals on the Ark. But the Ark did not contain every species, as it did not need to do so. Many animals survived the flood apart from the Ark. The humans and animals on the Ark were merely representative of all life on earth.
Therefore, after the Flood, there were many human persons on earth who were not descendants of Noah.
For more, see my book: Noah’s Flood: Literal or Figurative?
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