BUG: Missing or incomplete family tree

Problem

1. When I click on my family tree, there are Sims missing from it.
2. When I click on the family tree symbol, nothing happens

Cause
Traveling seems to mess-up family trees on a regular basis.

Solution 
None

Mods that solve the problem
Overwatch has a nightly routine that cleans-up and restores family trees
To repair or change family trees manually, use Twallan's MasterController Mod.