From the video's description:
'When Holly Shay went into labor with twins on New Year's Eve, she and her husband, Brandon knew it was going to be an interesting start to 2017. They were right because one of their sons, Sawyer Matthew Shay, was born in 2016 and the other, Everett Jackson, in 2017. The boys pulled this little stunt all on their own with no medical intervention. Mom wasn't induced and she didn't have a C-section. The Arizona couple already has two daughters.'
We've heard of twins born on different days - but this takes it to a whole new level! So weird. People aren't going to believe they're twins.