Hi Sharon,
There is a confusing wrinkle here. Edits to relationships should be tracked, but sometimes multiple relationships are changed in one edit, and those are not tracked. For example, if you add a child to a man, the system may ask you if the man's wife is the new child's mother. The child will be added to the mother, but the edit will only show for the father.
It's on the to-do list to work out a cleaner tracking system for this.
Chris