I don't recall the "exact" story being the same...
But I think each eliment of the story had been used before:
Mom -> didn't know she was preg
Rape produced a child not wanted
Dad slept with Daughter to produce child.
Dad wants to take the fall for daughter
New wife shocked....
Okay episode, but overall... just a reshuffl of multiple episodes before.
Now... Criminal Intent this week... that was a good one (I think....)