I am one of those who thinks its TERRIBLE that yeshivas have school on Sundays.
Sunday is the one day of the week you can get out of the house with everyone , not be locked in the house with kids fighting. Spend time with your kids without the pressure of claustraphobia (I realize many love Shabbos, but when the kids get Claustrophobia it is NOT Fun)
You can go to the Park, Go to museum , Go to Zoo. Beathe some fresh air