Children have not left the house for more than a month in a row, and even if they are home children, it is normal for them to have moments of more nervousness or irascibility. Their lives have completely changed and it is normal for those feelings that they do not express to come out in the form of disruptive behavior. that is why it is important that you help them calm those emotions.
The first way to make them calm those emotions is to help them express them, express how they feel and ask you everything they need to find the tranquility they need. It is important that you understand why it feels this way, think that children are not alien to the reality that is happening and feel and experience the same as we do.
If he's misbehaving, don't blame yourself or blame him ... It's his way of telling you he's not okay emotionally. Therefore, it is necessary that you connect emotionally with your children so that they feel more secure and comforted. Do not repress your emotions with phrases like "don't cry" or "nothing is wrong", "don't worry about that", etc. You may think that their emotions are not important but they are and you should respect and understand them.
You can use children's stories or videos to be able to talk about this topic. It is essential that you help him express his emotions and that he knows that you will be by his side all the time. You can also express how you feel in a way that your child understands and make it easier for everyone in this way.
Remember that routines and personal care are very important. Your children should see normality at home, despite possible difficulties. Your mood influences the education of your children, so you should not remove this from your perspective. Be aware that it is a situation that will not last forever and that the family must be united.