[Backdated to 30th November]
The Twins are a year old today (by Earth years anyway). Despite being born on the 1st November 2014 (by paradoxical island calendar).
Well, you know, you disappear from a paradoxical island for several months and find out you've actually been away from it for almost a month longer than you've lived through (again by Earth's reckoning). So they're new 'birthday' is the 30th November (in 2015 here anyway).