When identical twins Briana and Brittany Deane met identical twin brothers Josh and Jeremy Salyers, it was love at first sight.The sisters, 35, married the brothers, 37, in a joint ceremony back in 2018 and became pregnant months apart. Now the two couples share one-year-old sons - Jax and Jett - so genetically similar they’re more like brothers than cousins.The foursome live under the same roof and are one of about 300 ‘quaternary’ marriages in the whole world! “Jett and Jax were born to identical twin parents less than nine months apart,” Brittany explained to TODAY Parents.