Effective lease time when inherited? [ Edited ]

[#1]

Is it possible to query a Network, DHCP Range, etc. to find the effective lease time -- i.e. the one its inheriting?  It looks like the dhcplease-time is set to 12 hours if use_option is false. 

If not, then  is there a way to find an object's parent?  Or do we have to do a top down search  i.e. check the grid DHCP settings, then all the member settings, then recurse over network containers, until we find the network (and DHCP Range if we're goign down to that level) to figure out what lease time is being inherited ?  WAPI 2.7 (IB 8.2.2).