store data structure for dynamic object in pragma strict.

Is there a way to store a data structure for an object and its children if the structure is dynamic. The object can change dynamically and I want to keep track of the changes. I am on ios using pragma strict and don't know of any way to nest arrays dynamically. I am using Lists currently instead of Arrays and the Lists have to be predefined.

 var Parent = new List.<String>();

Is there some sort of asset or library for child/parent node structures?