memorable stories

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. The most memorable our ancestors’ stories passed down from time immemorial.
  2. The most memorable our ancestors’ stories were passed down from time immemorial.
  3. We commemorate our ancestors’ stories that were passed down from time immemorial.
    Please correct all.
    Thanks.
2

I’d prefer:
The most memorable stories about our ancestors were passed down from time immemorial.
We commemorate the stories about our ancestors passed down from time immemorial.

3
  1. The most memorable of our ancestors’ stories have been passed down from time immemorial.
  2. The most memorable of our ancestors’ stories were passed down from time immemorial. (‘were’ indicates that this no longer happens, so it is highly unlikely that this is the required tense).
  3. We commemorate our ancestors’ stories, which have been passed down from time immemorial.
4

Beeesneees,
‘We commemorate the stories about our ancestors since time immemorial.’
Is this sentence OK/
Thanks.

5

It is possible but it has a different meaning to (3).