What is Your Mothers' Mothers' Mothers' Mothers' Mothers' Mothers' Mother?
1.
Why do you have more than one mother? And why do they each have multiple mothers, and they as well?
Maybe lesbianism runs in the family somehow.
Or maybe your grammar just sucks.
2.
Your great great great great great grandmother.
"My mothers' mothers' mothers' mothers' mothers' mothers' mother's dead!"
See