I arrived at CDG T1 with my family at 7:00 AM for a 9:45 departure on a Saturday last August. Check-in was a madhouse. Although I had time to get us all checked in, file for a VAT refund, have a quick bite at the gate (I don't recommend Le Brioche Dorée!), and even to play a couple of tunes on the piano at the gate, we did not feel relaxed. We had wheelchair assistance which got us through security and through the airport faster than other passengers. I think two hours would be too little with kids their age. I'd plan to arrive two and a half hours early.