[mairdie]

My 5th great uncle was a Dutch Reform theologian who wrote a dissertation on why someone couldn’t marry their deceased spouse’s sibling.

http://www.henrylivingston.com/bios/jhl/marriage-jhl-p02-03.htm

[Tax-chick]

How interesting! I was baptized Dutch Reformed. My mother was from Philadelphia, and Northern Ireland before that.

That reasoning was why Stonewall Jackson didn’t marry the sister of his late first wife.

[null and void]

My 5th great uncle was a Dutch Reform theologian who wrote a dissertation on why someone couldn’t marry their deceased spouse’s sibling.

Hmmm? Wasn't that explicitly required if he had no offspring?

Deuteronomy 25:5-6

Assuming you meant deceased spouse's wife...