Which family member is called a mother-in-law?
Correct answer: Mother of the other's spouse

Old Fool
A collection of mothers-in-law is known as "the punishment for bigamy".

Mars V
“Mother of the other’s spouse.” ???

Mars V
Donna, predeceased, you mean?

Donna
Been married twice & never had one-both were predeased.

Faareha
The clue is I the name