Answer: $1,000
Step-by-step explanation:
Even though Megna and Britt are above the age of 17 and as such do not qualify for the child tax credit, they qualify for the Credit for Other Dependants.
Under this Credit, $500 can be deducted per dependant if certain conditions are fulfilled such as the dependents having a valid American identity number such as ATIN, ITIN, or SSN.
The dependants have to be your children or elderly parents.
With $500 in credit available per dependant and Sandy and Chris having 2 dependants in Megna and Britt, they can get a credit of $1,000 for the both of them.