What are the odds of dying on the same day as a parent?

This question does not have a definitive answer as it entirely depends on the circumstances.

If you and a parent are in a crashing plane or in a severe car crash, like with a semi or train, the odds could easily be 80 to 100 percent you'll both die on the same day.

If you and a parent have been diagnosed with incurable brain cancer & you both have exactly 1 month to live, the odds of dying on the exact same day are still unknown but could be relatively high, maybe 60 - 80 percent..

The odds of you and a parent just randomly dying without warning on the same day are so low it pretty much wouldn't happen.