You might check to see if you , and family, might be hypermobile.
Years of postures & habits can make subtle changes inthe body and if hypermobile even more so..

Hypermobility
http://hypermobility.org/beighton.php

I've had these for a long time so I hope they are still good links
Ergonomics links:
http://www.working-well.org/index.html
http://www.remedyint.com/ergoanswers/wrist_hand.html
http://www.office-ergo.com/alternat.htm
http://ergo.human.cornell.edu/ErgoTi...tationmain.htm