I'm trying to document an issue with an application, and I'd like to refer to the people using different words regardless of the relationship (father, son, etc.) being used.
To better explain the issue, see the following:
A. Carl is the father of Oscar.
B. Fred is the son of Martin.
I'd like to refer to A's Carl and B's Fred using the same word. I would think that they are the subject of the sentence, but is there a different word?
Also, A's Oscar and B's Martin should also have a word that refers to them. Are they the object of the sentence, or is there another word?