Brazil Covid 19 F1 F2 visas

I am from Brazil and in US on F1 visa and sponsoring my 2 children for their F2 visas. We have all 3 travelled between US AND BRAZIL several times. Due to covid 19 I need to send children back to Brazil. I must remain in US and my visa expires on 23/3/2020. If the children’s school starts back before I can go to Brazil to renew my visa, will my children be allowed to renew their visas and allowed to leave Brazil.