I have two kids. One is a 7-year-old and the other is a 11-year-old. Can they come to the art class during the same hours? And will they be in the same level/program?

Yes. You can book your children together for Sunday batches. But they will be taking classes with a mixed age group and different skill level students. They may get the same age or interest level at times. At times they may not. It depends on who enrols, but we cannot guarantee. But they will take the classes at the same time. That is possible.