Leah and her husband Kyle welcomed a son, Reid Joseph, born first in Denver, Colorado, at 1:18am Mountain time
Sarah (pictured with husband Nick) welcomed a daughter, Samantha Lynne, in La Jolla, California, on Pacific time
When each twin discovered their pregnancy, they each vowed to unveil the news at Thanksgiving
Leah was lucky enough to blurt out her news first, so considerate Sarah delayed her announcement to give her sister her own moment - just until she learned that their babies were due within four days of each other.
'I ran down the hallway and got the ultrasound pic out of my purse and slapped it down next to Leah's,' said Sarah.
Over the months, the pair were forced to continually deny suggestions that they had planned anything. And, as if to prove their serendipitous luck, the pair eventually both ended up in labor at the same time.
The sisters even think that the genders of the kids are big coincidences, given that Sarah, the self-described 'tomboy', had a son, while the 'girlier' twin Leah had a girl.