People's fingerprints don't change over time, but it would be intriguing if they did.
It's a pretty pompous title in my opinion, but it fits this film perfectly.

Would this be a bad time to add in, Fingerprints on people actually do change over time.

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I love that song!!

The closest thing I can think of a connection of title to story is that the family is a connection of unique individuals, as the siblings are shown to be very different, and often unconnected people. Personally, I thought the title a bit pretentious and not adquately discriptive my own self.

The Myth of Fingerprints is from Paul Simon's album Graceland, and I'm a bit disgruntled to see that Sean Gallagher the featured reviewer notes the title came from a Simon and Garfunkle song. Um, get with it, Sean.

Thanks TemporaryOne

Here is a quote from the director:
About the title, Freundlich remarks,
It's about identity and how it's not a constant the way a fingerprint is. People change and you might not always be able to find them by examining just one mark they make in their life - you might have to grow with them and change with them and accept how they change in order to continually find them to be someone you know.
I mean is there actually something that is a core to your identity, like your family, your childhood? Are those things always defining you or are you constantly changing, moving away from them? I guess both.
http://www.sonyclassics.com/myth/production.html

"The Myth of Fingerprints" comes from the notion that every fingerprint, like a snowflake, is unique (no two are alike). I haven't seen the movie yet, but I hope this fit in somewhere with the movie's theme.