My wife's been doing something similar, if far less extensive for us, actually: she takes identical portraits of the kids on their birthdays, and it's fascinating to see them grow up and change--and not. It's always a bit of a wrestle, though, to coax interesting, expressive photos out of squirmy/self-conscious/distracted kids.
So hats off to Dutch filmmaker/dad Frans Hofmeester, who has been shooting brief video portraits of his kids week in and week out for 12 and 9 years.
Because his big sister Lotte's video has been making the rounds, getting Internet-famous, I figured I'd try to give Vince's movie a plug. I can only imagine it can be a pain being the younger sibling.