If next year 2021 works like 2020 returns you will not have to pay back some of the 3rd stimulus if you got too much. Sounds like you got $5,600 ($1,400 for 4 people) based on your 2019 return? But you won't be claiming the 2 dependents on your 2021 return. And if your 2019 dependents file their own 2021 returns they can also claim the 3rd stimulus even if you got it for them.
