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.
1 in 730
There are no odds. It just happens.
None.
I don't know what the exact odds are but it does happen: My Mum and her older sister are born on the same day 3 years apart, add to the statistical odds of fun I was also born on the same day. Save don't very likely
That same day.
coincidence
My Dying Day was created in 2006.
She is not dying.
You can get it dyed and cut all the same day.
Anthem of Our Dying Day was created in 2002.
Yes if you are changing faiths, and you have an in with the Father, it can be done.
The duration of The Long Day's Dying is 1.58 hours.