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A set of twins is expecting twins, after delivering twins three and four years ago.
Let that sink in for a moment.
Twins who are already mothers of twins and are each expecting twins two weeks apart.
Kerri Bunker and Kelli Wall are sisters with the amazing story of timing and childbearing that's going viral.
The women, who are both mothers of twins, both became pregnant with their first children by in vitro fertilization, KSL reported.
Bunker is mom to 3-year-old fraternal twins Kole and Hallie.
They are 11 months younger than Wall's fraternal twins, 4-year-olds Madison and McKell.
When Wall found out she was pregnant, Bunker decided to do a pregnancy test herself, despite the fact that doctors told her that she had slim odds of getting pregnant without medical assistance, KSL reported.
The test was positive and two weeks later, she found out she was joining her sister carrying twins, and the four babies were due in March.
"It's a unique story, because I always felt like my twin sister and I had a special bond, Bunker told KSL. "And we've always kind of looked out for one another, and I thought 'oh wouldn't that be fun to have our kids experience that same thing."
Both Bunker and Wall are elementary school teachers at the same school. Bunker teaches third grade. Wall teaches fifth grade.
They also married, not twins, but best friends.