Hi Kathie....

the only thing ever asked of my girls was their names....never need birth certificates or passports.

Maybe since it will be just your husband and you, if there is an extra carseat at your sons house you could take it with you and check it at the gate? that way it would already be in Orlando and when you go to pick them up you can have it all set for them. Another suggestion is on your way to the airport stop off at walmart and you can get a booster for under $20 for your grandson (loads cheaper instead of renting it from the car rental company).....

just a few thoughts!

Pamela