binary tree in java language

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Java

I have binary tree in java to build family members tree.

In add function, I want to determine the parent that will have new child, after that, the user enter the name of new child.

The problem I face is the family tree cannot compare such as the tree has integer numbers.

Is there a method to do this?

This is a main in my code

static public void main(String args[])
  {
      System.out.println(">>> creating empty tree");
      StringBinaryTree t = new StringBinaryTree();
      System.out.println(">>> adding elements to the tree");
      t.add("lion","");
      t.add("shark","r");
      t.add("elephant","l");
      t.add("zebra","rr");
  }

Thanks for the help