Two sisters have left people baffled after saying their two sons are brothers, cousins and twins.

Brittany and Briana are identical twins who married identical twins Josh and Jeremy Salyers and then gave birth to babies within months of one another.

They uploaded an Instagram post of their adorable sons Jett and Jax and said they are “Cousins, genetic brothers, and quaternary twins.”

Many people took to the comments confused at how this was possible.

A mother in California decided to help out others and signed up to be a surrogate mother. Jessica Allen already had a beautiful family of her own with her husband and their two children, so she decided she wanted to help make other couples happy who either couldn’t or chose not to conceive on their own. After choosing to become a surrogate mother and getting matched with another couple, she successfully had an embryo implanted, but something strange happened a few weeks later that would change her life forever.

One baby is cute enough — but two? Twins make everything twice as wonderful! Our hearts always give a leap of joy when we see babies, and seeing twins is even more joyful. There are two types of twins: identical and fraternal. Identical twins are the result of one fertilized egg that splits into two, while fraternal twins result when two separate eggs are fertilized. Essentially, fraternal twins are just two siblings born on the same day.

In this story from 2019, a rare medical condition led one woman in Bangladesh to give birth to three babies, 26 days apart. It's a story that will blow your mind and make you wonder if it could happen to you.

Her husband is a hardworking laborer who makes less than $70 per month. Despite their limited means, they were going to give this baby the best life they could.