nothing!! people here are not checked from one state to another state only at the border to another country like canada or mexico!!
nothing... you re not going out of the country. i mean, you need to buy them a plane ticket if they can t sit in your lap (which you have two kids so im sure they cant). bring their birth certificate just to be safe.
If you are flying...they need nothing...kids under 18 are not required to have i.D. if you are driving...same thing...nothing.
Another State? You don t need anything if you aren t leaving the United States.