Hi,
Found these two wonderful articles that explains Team Ownership and Reparent feature in depth
Do check them out !
http://andrewbschultz.com/2011/06/17/the-architecture-of-team-security-in-crm-2011/
http://andrewbschultz.com/2011/10/10/isolated-dynamics-crm-security-feature-reparent/
Bye.