Why can't I find Downton Abbey. I have been watching year one, and 3 episodes. How do I find it?

SOURCE: How do I watch a tv series on Netflix that I have already viewed?

Click the "Browse" link, and you will see a Recently Watched section. Click on the words "Recently Watched," and it will take you to a list of your activity.

You can also click on the little down arrow next to your profile icon in the upper right-hand corner. From the menu that drops down, click on "Your Account." In the "Your Profile" activity, click on "Viewing activity."

Either way, you'll see a chronological list of everything you've viewed, starting with the most recent.

SOURCE: Case in point. I started to watch Blue Bloods series and now my wife desires to see the episodes I have already viewed. How do I go back so she can watch the same episodes I have already viewed?

Click the title of the series ( clicking anywhere but the title will start the series from the last espisode viewed ) it will open a new page where it will display all the series with episodes, select season 1, first episode ( pilot episode) grab the popcorn and enjoy.

Solution number 2 - netflix account allows 3 subaccounts, create one for your wife, when you open Netflix you will be asked what subaccount you want to be active, select your wife one, go to the desired series and they will start from the first episode ( granted that your wife never watched any ).
This is the best method as you will never lose the last episode watched bookmark.