Miriam and Vivian are in the short window each year when they are the same age. Two five-year-olds. Viv's glory days. Miriam's "I'M STILL OLDER THAN YOU" days.
One more day of two five-year-olds. And then Miriam will settle back into her comfortable Oldest Sister position. Vivian will continue to be exactly who she is. And Felicity will watch it all in admiration and continue to tell anyone who asks how old she is "FIVE!"