We are family of 4 visiting Paris next month. We are planning on using Navigo cards (can it be purchased on the Gare du Nord, as this is where we arrive? what are the standards for photos?). On our last day we need to transport ourselves from Residence Du Parc Val d'Europe to Charles de Gaulle. I know there is TVG from Disneyland to CDG. Will the Navigo card cover it? or will we need to use different way to get there? Thank you for any suggestions.
Navigo Decouverte is sold at Gare du Nord. You can visit the Transilien ticket window to buy Navigo passes (likely the least hectic ticket window) which is on the same level as the surface trains.
There is a TGV train between Disneyland Paris & CDG Airport, but it is not covered by Navigo. To use your Navigo passes & RER trains to get from Paris to CDG you would take RER A from Val d'Europe to Chatelet les Halles, then transfer to RER B in direction Aeroport Charles de Gaulle 1 & 2 (Terminal 1 & 3 or Terminal 2).