A Genealogy Riddle

Here’s a genealogy riddle for you.

My grandmother’s father-in-law was also her brother-in-law. How was this possible?

Hint: There is no incest in the connection

Post your replies in the comments below. I will explain the connection in a week if no one gets it.

Please feel free to leave a comment, and although they are appreciated, please note that I may not be able to respond to all comments

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