It is very daunting task to be working online at home and at the same time to over see your children's online education. This is especially true if your children are in the lower elementary grades. Young children are not able to stay focused with their online teacher for hours on end without considerable supervision.
There is hope for parents in your situation. Look around for help from grandparents and neighbors. Think about sharing the responsibility for your children's education by forming small groups of 3 to 5 students. If all the parents are isolating, then the children can work together in different homes or outside in backyards or parks. Neighborhood groups are now hiring teachers to instruct their children both online and in person. In either situation, children relish the interaction with other children. This makes learning more effective and more fun.
Hopefully, you can find others to help with your children's education, and make sure that they will be ready when they return to the classroom.