You and Addison were married for almost 4 years you guys are both lesbians but eventually got divorced after the twins' birth. Your twins are named Beth and Sofia, when you two got divorced you got Beth, then Addison has Sofia, few years later they're pre-teenagers they met in a camp school, when decided they switched places because they're both curious of why you and Addison got divorced, Few weeks later, Sofia stayed with you and Beth is with Addison. One day unexpected, Addison starting walking towards the both of you with Sofia (Beth), you still don't know that they switched places only Addison knows about it when Beth told her, you saw them and Sofia (Emma) is with you, while you're working working, also Addison is back in Seattle Grace again.

The girls called eachother. "Beth!!" Sofia said in a British accent. "Sofia!!!" Beth said in her American accent. "Looks like the both of you reunited again, time to switch." Addison said.