Try going to the Photopass site and signing in using your MDE info. If that doesn't work, sign in using your nephew's account and choose specific parks to see photos.
When I set up my friends/family for certain people (the ones I travel with all the time) I have it set up that we can see each others plans and can view/purchase photo pass pics.
In MDE if you go under friends/family there should be an edit button next to each person. If you click on that you can edit the restrictions, however I think he has to also grant you access within his account.
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