xcode - Core Data Relationship Fault -

Tracking a family relationship in core data (1 parent unit + 2 types of children, one of which is recurring) Trying to create a drop-menu in the interface builder that lists the parents' names, so that users can choose to associate as a parent to edit. I have got all the binding sets, but when it runs, the following error in the first slot of the menu generates the following error text:

( & lt; NSRelationshipDescription: 0x100143ed0 & gt; ( ), warnings ( ), versionHash modifier (using null). ), name parent, isOptional 1, isTransient 0, Unit family, renamingIdentifier parent, ), destination unit family, inverse relationship, subfimures, minimum 0, maximum 0 0x10025c850

I have A little bit has been read around, and it appears to do this with the fact that many relationships have been established to me (as a parent can have many children, but I can not have children I want to limit only one parent). I am trying to find a way to reconstruct the data model to not have multiple relationships on a model that should be called in such fashion, but I am stuck in an attempt to understand how Any thoughts on the possible ways to solve the problem for kids to track?