"You mention "detaching" the non-ancestor. Is that the way I should proceed."
"There aRE NO OTHER TIES TO ME TREE THAT I WOULD WANT TO KEEP"
I'm not sure I know what that means.
"If I jest detach, would those people still remain in my database?"
No, detaching just disconnects relationships. It does not delete people.
"Not sure how else to describe what I want to do. But I want to delete person X, his wife, and all of x's ancestors."
See the step by step directions in my post above. (PS. I suggest making a backup copy of your file before you delete anthing.)