You and Addison were married for almost 4 years but eventually got divorced after the twins' birth. Your twins are named Emma and Sophia, when you two got divorced you got Sophia, then Addison has Emma, 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, Sophia stayed with you and Emma is with Addison. One day unexpected, Addison starting walking towards the both of you with Emma (Sophia), you still don't know that they switched places only Addison knows about it when Sophie told her, you saw them and Sophia (Emma) is with you, while you're working working, also Addison is back in Seattle Grace again.

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