he fast TGV train costs about € 30 unless you buy tickets well in advance, so quite expensive for a family. Prem tickets bought 90 days in advance cost about € 15. The TGV runs every day, every 20 - 60 mins depending on the time of day, and whether peak time. It takes 10 mins from MLV Chessy to CDG.
The TGV station at CDG is in terminal 2 between 2 C/D and 2 E/F so you may then have to take the CDGVAL shuttle to your departure Terminal and your checkin desk, so you have to allow time for this as well.
Which hotel are you staying in, as this makes a difference to timing for the VEA buses. They do not run as frequently to/ from the non Disney hotels usually. You can see the timetable on the VEA website, and the order in which it picks up people from hotels. They recommend that you catch a bus 3 hrs minimum before your flight time. If your hotel is the first pick up stop, then remember that it will be stopping at the others before heading to the airport, so this takes extra time of course, depending on how many are getting off/ on.
www.vea-shuttle.co.uk/vea-bus-timetable.asp
The ones recommended are -
http://www.isprestige.com/
http://www.ezyshuttle.com/
http://www.prestige-transfer.com/
http://www.shuttle-transfers.net/
For shared and private transfers see this one
parishuttle.com/…
I know someone who used Ezyshuttle last August, which is owned by a friendly Irish man named John. They are booking him again for October. He picked them up from their hotel 3 hours before our flight time, and the return journey only took 30 mins straight to the departure Terminal entrance.
Other posters like isprestige as they usually have a DVD player showing Disney movies for kids.
Private transfer prices depend on the number of passengers. They all have appropriate child seats.
As I said before, queues can be very long at CDG so I would allow 3 hrs whichever transport you use.